Page 1 of 10
Class Time_______________ Day_____________________
School of Business
Business Statistics I
Exam 5
Print out this test. Do all your calculations on the test and mark your final
answer on the scantron sheet (answer sheet. If you don’t have a scantron sheet,
one will be provided in the class.Turn‐in both your test and the answer sheet. Do
not forget to write your name, Id#, and class time on both the answer sheet and
the test.
Name____________________________________ID #______________
1. Suppose a random sample of 36 items is selected from a population. The population
standard deviation is known to be 10. The standard error of the mean would be:
(a) 1.333
(b) 1.667
(c) 3.667
(d) 2.333
(e) 1.875
2. From 100 homes of similar sizes, a sample of 25 homes is selected to study the average
home heating cost during the winter months. Suppose the heating cost is known to be
normally distributed with mean of $220 per month for the four months of winter and
standard deviation of $45. If the 100 homes represent the population size, the standard
error of the heating cost would be:
(a) 9.00
(b) 8.75
(c) 3.66
(d) 7.83
(e) 1.87
3. Suppose n=64 measurements is selected from a population with mean 20 and
standard deviation 16 . The Z‐score corresponding to a value of 24x would be:
(a) 2.0
(b) 3.0
(c) ‐2.5
(d) ‐2.0
Page 2 of 10
(e) 1.5
4. A random sample of n=100 observations is selected from a population with 30 and
standard deviation 16 . The probability that ( 28)p x is
(a) 0.8236
(b) 0.8936
(c) 0.9036
(d) 0.9983
(e) 0.8944
5. A random sample of n=100 observations is selected from a population with 30 and
standard deviation 16 . The probability that (22.1 26.8)p x is
(a) 0.0434
(b) 0.0228
(c) 0.0036
(d) 0.0983
(e) 0.0944
6. A random sample of size 36 is drawn from a population with mean 278 . If 86% of
the time the sample mean is less than 281, then the population standard deviation
would be:
(a) 16.67
(b) 12.67
(c) 11.12
(d) 13.33
(e) 19.67
7. A random sample of size n=81 is drawn from population with mean equal to 50 and
standard deviation 25. The expected value of the mean ( )iE x [or, x ] and the standard
error
x
(a) 50 and 2.95
(b) 50 and 2.78
(c) 28 and 1.72
(d) 50 and 15.00
(e) 80 and 12.0
8. According to a recent news report, the average price of gasoline is $3.80 per gallon
(March 2011). This price can be considered as the nationwide population mean price
per gallon. Suppose that the standard deviation of the gasoline price per gallon is
$0.50. A sample of 49 gas stations in Salt Lake City is taken. The probabilit.
1You run a gizmo factory. Over the past y.docxjeanettehully
1
You run a gizmo factory. Over the past year the average output of the factory is 480 gizmos and the standard deviation of that output is 10 units per day. In repeated random samples of size n = 40 days, the expected value of sample mean is:
a
12
b
480
c
76
d
48
2
In the previous question the variance of the sample mean is.
a
10
b
2.5
c
15.8
d
1.58
3
Using the population mean and standard deviation in question 1, what is the probability that the mean of a random sample of n
= 40 days exceeds 482 gizmos:
a
0.1020
b
0.0571
c
0.0384
d
0.0287
4
Using the population mean and standard deviation in question 1, in repeated samples of size n = 40, 95% of sample means fall within that fall within
±
_____ gizmos from the population means.
a
3.9
b
3.5
c
3.1
d
2.7
5
In the population of employees in your company, 35 percent contribute to the annual United Way campaign. You plan to take a sample of size n = 200 and calculate the sample proportion who contribute to United Way.
The expected value of the sample proportion is:
a
0.035
b
0.25
c
0.35
d
0.40
6
In the previous question, the standard error of the sample proportion is:
a
0.0473
b
0.0415
c
0.0398
d
0.0337
7
In the previous question, 90 percent of sample proportions from samples of size n = 100 deviate from the population proportion of 0.35 by no more that
±____ (or ____ percentage points).
a
0.036
(3.6 percentage points.)
b
0.042
(4.2 percentage points.)
c
0.048
(4.8 percentage points.)
d
0.055
(5.5 percentage points.)
8
There is a population of 10 families in a small neighborhood. You plan to take a random sample of 4 families (without replacement). How many samples of size n = 4 are possible.
a
40
b
80
c
210
d
400
9
The expression
means:
a
In repeated sampling the probability that population mean is within ±1.96σ/√n from x̅ is 0.95.
b
In repeated sampling the probability that x̅ is within ±1.96σ/√n from the population mean is 0.95.
c
95% of sample means deviate from the population mean by no more than 1.96σ/√n in either direction.
d
Both b and c are correct.
10
The population proportion of Americans with diabetes is 9 percent (π = 0.09). In repeated random samples of n = 800 Americans, 90% of sample proportions of people with diabetes would fall within ±______ from π.
a
0.01
(1.0 percentage point)
b
0.017
(1.7 percentage points)
c
0.029
(2.9 percentage points)
d
0.036
(3.6 percentage points)
11
As part of a statistics assignment in October to estimate the percentage of voters who would vote for a mayoral candidate, each of 500 students collects his or her own random sample of likely vote.
Points: 250
Assignment 3:Biggest Challenges Facing Organizations in the Next 20 Years
Criteria
Unacceptable
Below 60% F
Meets Minimum Expectations
60-69% D
Fair
70-79% C
Proficient
80-89% B
Exemplary
90-100% A
1. Provide a title slide followed by a slide with an introduction to your presentation.
Weight: 5%
Did not submit or incompletely provided a title slide followed by a slide with an introduction to your presentation.
Insufficiently provided a title slide followed by a slide with an introduction to your presentation.
Partially provided a title slide followed by a slide with an introduction to your presentation.
Satisfactorily provided a title slide followed by a slide with an introduction to your presentation.
Thoroughly provided a title slide followed by a slide with an introduction to your presentation.
2. Presentation should include your choice of the five (5) challenges you believe organizations will face in the next twenty (20) years. Only include one (1) challenge and your explanation for choosing that challenge per slide for a total of five (5) slides. Weight: 50%
Did not submit or incompletely included your choice of the five (5) challenges you believe organizations will face in the next twenty (20) years. Did not submit or incompletely included one (1) challenge and your explanation for choosing that challenge per slide for a total of five (5) slides.
Insufficiently included your choice of the five (5) challenges you believe organizations will face in the next twenty (20) years. Insufficiently included one (1) challenge and your explanation for choosing that challenge per slide for a total of five (5) slides.
Partially included your choice of the five (5) challenges you believe organizations will face in the next twenty (20) years. Partially included one (1) challenge and your explanation for choosing that challenge per slide for a total of five (5) slides.
Satisfactorily included your choice of the five (5) challenges you believe organizations will face in the next twenty (20) years. Satisfactorily included one (1) challenge and your explanation for choosing that challenge per slide for a total of five (5) slides.
Thoroughly included your choice of the five (5) challenges you believe organizations will face in the next twenty (20) years. Satisfactorily included one (1) challenge and your explanation for choosing that challenge per slide for a total of five (5) slides.
3. Provide one (1) summary slide which addresses key points of your paper.
Weight: 5%
Did not submit or incompletely provided one (1) summary slide which addresses key points of your paper.
Insufficiently provided one (1) summary slide which addresses key points of your paper.
Partially provided one (1) summary slide which addresses key points of your paper.
Satisfactorily provided one (1) summary slide which addresses key points of your paper.
Thoroughly provided one (1) summary slide which addresses key points of your paper.
4. Narrate each slide,.
1You run a gizmo factory. Over the past y.docxjeanettehully
1
You run a gizmo factory. Over the past year the average output of the factory is 480 gizmos and the standard deviation of that output is 10 units per day. In repeated random samples of size n = 40 days, the expected value of sample mean is:
a
12
b
480
c
76
d
48
2
In the previous question the variance of the sample mean is.
a
10
b
2.5
c
15.8
d
1.58
3
Using the population mean and standard deviation in question 1, what is the probability that the mean of a random sample of n
= 40 days exceeds 482 gizmos:
a
0.1020
b
0.0571
c
0.0384
d
0.0287
4
Using the population mean and standard deviation in question 1, in repeated samples of size n = 40, 95% of sample means fall within that fall within
±
_____ gizmos from the population means.
a
3.9
b
3.5
c
3.1
d
2.7
5
In the population of employees in your company, 35 percent contribute to the annual United Way campaign. You plan to take a sample of size n = 200 and calculate the sample proportion who contribute to United Way.
The expected value of the sample proportion is:
a
0.035
b
0.25
c
0.35
d
0.40
6
In the previous question, the standard error of the sample proportion is:
a
0.0473
b
0.0415
c
0.0398
d
0.0337
7
In the previous question, 90 percent of sample proportions from samples of size n = 100 deviate from the population proportion of 0.35 by no more that
±____ (or ____ percentage points).
a
0.036
(3.6 percentage points.)
b
0.042
(4.2 percentage points.)
c
0.048
(4.8 percentage points.)
d
0.055
(5.5 percentage points.)
8
There is a population of 10 families in a small neighborhood. You plan to take a random sample of 4 families (without replacement). How many samples of size n = 4 are possible.
a
40
b
80
c
210
d
400
9
The expression
means:
a
In repeated sampling the probability that population mean is within ±1.96σ/√n from x̅ is 0.95.
b
In repeated sampling the probability that x̅ is within ±1.96σ/√n from the population mean is 0.95.
c
95% of sample means deviate from the population mean by no more than 1.96σ/√n in either direction.
d
Both b and c are correct.
10
The population proportion of Americans with diabetes is 9 percent (π = 0.09). In repeated random samples of n = 800 Americans, 90% of sample proportions of people with diabetes would fall within ±______ from π.
a
0.01
(1.0 percentage point)
b
0.017
(1.7 percentage points)
c
0.029
(2.9 percentage points)
d
0.036
(3.6 percentage points)
11
As part of a statistics assignment in October to estimate the percentage of voters who would vote for a mayoral candidate, each of 500 students collects his or her own random sample of likely vote.
Points: 250
Assignment 3:Biggest Challenges Facing Organizations in the Next 20 Years
Criteria
Unacceptable
Below 60% F
Meets Minimum Expectations
60-69% D
Fair
70-79% C
Proficient
80-89% B
Exemplary
90-100% A
1. Provide a title slide followed by a slide with an introduction to your presentation.
Weight: 5%
Did not submit or incompletely provided a title slide followed by a slide with an introduction to your presentation.
Insufficiently provided a title slide followed by a slide with an introduction to your presentation.
Partially provided a title slide followed by a slide with an introduction to your presentation.
Satisfactorily provided a title slide followed by a slide with an introduction to your presentation.
Thoroughly provided a title slide followed by a slide with an introduction to your presentation.
2. Presentation should include your choice of the five (5) challenges you believe organizations will face in the next twenty (20) years. Only include one (1) challenge and your explanation for choosing that challenge per slide for a total of five (5) slides. Weight: 50%
Did not submit or incompletely included your choice of the five (5) challenges you believe organizations will face in the next twenty (20) years. Did not submit or incompletely included one (1) challenge and your explanation for choosing that challenge per slide for a total of five (5) slides.
Insufficiently included your choice of the five (5) challenges you believe organizations will face in the next twenty (20) years. Insufficiently included one (1) challenge and your explanation for choosing that challenge per slide for a total of five (5) slides.
Partially included your choice of the five (5) challenges you believe organizations will face in the next twenty (20) years. Partially included one (1) challenge and your explanation for choosing that challenge per slide for a total of five (5) slides.
Satisfactorily included your choice of the five (5) challenges you believe organizations will face in the next twenty (20) years. Satisfactorily included one (1) challenge and your explanation for choosing that challenge per slide for a total of five (5) slides.
Thoroughly included your choice of the five (5) challenges you believe organizations will face in the next twenty (20) years. Satisfactorily included one (1) challenge and your explanation for choosing that challenge per slide for a total of five (5) slides.
3. Provide one (1) summary slide which addresses key points of your paper.
Weight: 5%
Did not submit or incompletely provided one (1) summary slide which addresses key points of your paper.
Insufficiently provided one (1) summary slide which addresses key points of your paper.
Partially provided one (1) summary slide which addresses key points of your paper.
Satisfactorily provided one (1) summary slide which addresses key points of your paper.
Thoroughly provided one (1) summary slide which addresses key points of your paper.
4. Narrate each slide,.
Midterm 2 – Practice Exercises
1
1. The amount of material used in making a custom sail for a sailboat is normally
distributed with a standard deviation of 64 square feet. For a random sample of 15
sails, the mean amount of material used is 912 square feet. Which of the following
represents a 99% confidence interval for the population mean amount of material
used in a custom sail?
A. 912 ± 49.2
B. 912 ± 42.6
C. 912 ± 44.3
D. 912 ± 46.8
2. The number of beverage cans produced each hour from a vending machine is
normally distributed with a standard deviation of 8.6. For a random sample of 12
hours, the average number of beverage cans produced was 326.0. Assume a 99%
confidence interval for the population mean number of beverage cans produced
per hour. Calculate the margin of error of the 99% confidence interval.
A. 1.85
B. 3.60
C. 6.41
D. 10.56
3. The number of beverage cans produced each hour from a vending machine is
normally distributed with a standard deviation of 8.6. For a random sample of 12
hours, the average number of beverage cans produced was 326.0. Assume a 99%
confidence interval for the population mean number of beverage cans produced
per hour. Find the upper confidence limit of the 99% confidence interval.
A. 340.25
B. 325.98
C. 319.59
D. 332.41
4. If we change a 95% confidence interval estimate to a 99% confidence interval
estimate, we can expect
A. the size of the confidence interval to increase
B. the size of the confidence interval to decrease
C. the size of the confidence interval to remain the same
D. the sample size to increase
Midterm 2 – Practice Exercises
2
5. If a sample has 20 observations and a 90% confidence estimate for µ is needed,
the appropriate t‐score is:
A. 2.120
B. 1.746
C. 2.131
D. 1.729
6. We are interested in conducting a study to determine what percentage of voters
would vote for the incumbent member of parliament. What is the minimum size
sample needed to estimate the population proportion with a margin of error of
0.07 or less at 95% confidence?
A. 200
B. 100
C. 58
D. 196
7. The sample size needed to provide a margin of error of 2 or less with a 0.95
confidence coefficient when the population standard deviation equals 11 is
A. 10
B. 11
C. 116
D. 117
8. The manager of the local health club is interested in determining the number of
times members use the weight room per month. She takes a random sample of 15
members and finds that over the course of a month, the average number of visits
was 11.2 with a standard deviation of 3.2. Assuming that the monthly number of
visits is normally distributed, which of the following represents a 95% confidence
interval for the average monthly usage of all health club members?
A. 11.2 ± 1.74
B. 11.2 ± 1.77
C. 11.2 ± 1.62
D. 11.2 ± 1.83
Midterm 2 – Practice Exercises
3
9. The s.
Midterm 2 – Practice Exercises
1
1. The amount of material used in making a custom sail for a sailboat is normally
distributed with a standard deviation of 64 square feet. For a random sample of 15
sails, the mean amount of material used is 912 square feet. Which of the following
represents a 99% confidence interval for the population mean amount of material
used in a custom sail?
A. 912 ± 49.2
B. 912 ± 42.6
C. 912 ± 44.3
D. 912 ± 46.8
2. The number of beverage cans produced each hour from a vending machine is
normally distributed with a standard deviation of 8.6. For a random sample of 12
hours, the average number of beverage cans produced was 326.0. Assume a 99%
confidence interval for the population mean number of beverage cans produced
per hour. Calculate the margin of error of the 99% confidence interval.
A. 1.85
B. 3.60
C. 6.41
D. 10.56
3. The number of beverage cans produced each hour from a vending machine is
normally distributed with a standard deviation of 8.6. For a random sample of 12
hours, the average number of beverage cans produced was 326.0. Assume a 99%
confidence interval for the population mean number of beverage cans produced
per hour. Find the upper confidence limit of the 99% confidence interval.
A. 340.25
B. 325.98
C. 319.59
D. 332.41
4. If we change a 95% confidence interval estimate to a 99% confidence interval
estimate, we can expect
A. the size of the confidence interval to increase
B. the size of the confidence interval to decrease
C. the size of the confidence interval to remain the same
D. the sample size to increase
Midterm 2 – Practice Exercises
2
5. If a sample has 20 observations and a 90% confidence estimate for µ is needed,
the appropriate t‐score is:
A. 2.120
B. 1.746
C. 2.131
D. 1.729
6. We are interested in conducting a study to determine what percentage of voters
would vote for the incumbent member of parliament. What is the minimum size
sample needed to estimate the population proportion with a margin of error of
0.07 or less at 95% confidence?
A. 200
B. 100
C. 58
D. 196
7. The sample size needed to provide a margin of error of 2 or less with a 0.95
confidence coefficient when the population standard deviation equals 11 is
A. 10
B. 11
C. 116
D. 117
8. The manager of the local health club is interested in determining the number of
times members use the weight room per month. She takes a random sample of 15
members and finds that over the course of a month, the average number of visits
was 11.2 with a standard deviation of 3.2. Assuming that the monthly number of
visits is normally distributed, which of the following represents a 95% confidence
interval for the average monthly usage of all health club members?
A. 11.2 ± 1.74
B. 11.2 ± 1.77
C. 11.2 ± 1.62
D. 11.2 ± 1.83
Midterm 2 – Practice Exercises
3
9. The s ...
1. (2 points)Two random samples are selected from two indepe.docxSONU61709
1. (2 points)
Two random samples are selected from two independent pop-
ulations. A summary of the samples sizes, sample means, and
sample standard deviations is given below:
n1 = 37, x̄1 = 52.4, s1 = 5.8
n2 = 48, x̄2 = 75, s2 = 10
Find a 92.5% confidence interval for the difference µ1− µ2
of the means, assuming equal population variances.
Confidence Interval =
Answer(s) submitted:
•
(incorrect)
2. (2 points) In order to compare the means of two popu-
lations, independent random samples of 238 observations are
selected from each population, with the following results:
Sample 1 Sample 2
x1 = 1 x2 = 3
s1 = 120 s2 = 200
(a) Use a 97 % confidence interval to estimate the difference
between the population means (µ1−µ2).
≤ (µ1−µ2)≤
(b) Test the null hypothesis: H0 : (µ1− µ2) = 0 versus the al-
ternative hypothesis: Ha : (µ1− µ2) 6= 0. Using α = 0.03, give
the following:
(i) the test statistic z =
(ii) the positive critical z score
(iii) the negative critical z score
The final conclustion is
• A. We can reject the null hypothesis that (µ1−µ2) = 0
and accept that (µ1−µ2) 6= 0.
• B. There is not sufficient evidence to reject the null hy-
pothesis that (µ1−µ2) = 0.
(c) Test the null hypothesis: H0 : (µ1−µ2) = 26 versus the al-
ternative hypothesis: Ha : (µ1−µ2) 6= 26. Using α = 0.03, give
the following:
(i) the test statistic z =
(ii) the positive critical z score
(iii) the negative critical z score
The final conclustion is
• A. We can reject the null hypothesis that (µ1−µ2) = 26
and accept that (µ1−µ2) 6= 26.
• B. There is not sufficient evidence to reject the null hy-
pothesis that (µ1−µ2) = 26.
Answer(s) submitted:
•
•
•
•
•
•
•
•
•
•
(incorrect)
3. (2 points) Two independent samples have been selected,
70 observations from population 1 and 83 observations from
population 2. The sample means have been calculated to be
x1 = 14.9 and x2 = 10.5. From previous experience with these
populations, it is known that the variances are σ21 = 20 and
σ22 = 21.
(a) Find σ(x1−x2).
answer:
(b) Determine the rejection region for the test of H0 :
(µ1−µ2) = 2.92 and Ha : (µ1−µ2)> 2.92 Use α = 0.05.
z >
(c) Compute the test statistic.
z =
The final conclustion is
• A. We can reject the null hypothesis that (µ1− µ2) =
2.92 and accept that (µ1−µ2)> 2.92.
• B. There is not sufficient evidence to reject the null hy-
pothesis that (µ1−µ2) = 2.92.
(d) Construct a 95 % confidence interval for (µ1−µ2).
≤ (µ1−µ2)≤
Answer(s) submitted:
•
•
•
•
•
•
(incorrect)
4. (2 points) Randomly selected 100 student cars have ages
with a mean of 7.2 years and a standard deviation of 3.4 years,
while randomly selected 85 faculty cars have ages with a mean
of 5.4 years and a standard deviation of 3.3 years.
1
1. Use a 0.01 significance level to test the claim that student
cars are older than faculty cars.
The test statistic is
The critical value is
Is there sufficient evidence to support the claim that student
cars are older than faculty cars?
• A. Yes
• ...
1) A sample of 10 observations is selected from a normal populatio.docxdorishigh
1) A sample of 10 observations is selected from a normal population for which the population standard deviation is known to be 6. The sample mean is 23. (Round your answers to 3 decimal places.)
A) The standard error of the mean is ________
B) The 99 percent confidence interval for the population mean is between _______and ________
2) The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 20 eggs per month with a standard deviation of 2.63 eggs per month (Round your answer to 3 decimal places.)
A) What is the best estimate of this value?
B) For a 99 percent confidence interval, the value of t is ______
C) The 99 percent confidence interval for the population mean is _______to ________
3) As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 230 applicants 26 failed the test.
A) Develop a 90 percent confidence interval for the proportion of applicants that fail the test. (Round your answers to 3 decimal places.)
For the applicants the confidence interval is between _______ and _______
B) Would it be reasonable to conclude that more than 11 percent of the applicants are now failing the test? Yes or No
C) In addition to the testing of applicants, Fashion Industries randomly tests its employees throughout the year. Last year in the 520 random tests conducted, 22 employees failed the test. Would it be reasonable to conclude that less than 6 percent of the employees are not able to pass the random drug test? Yes or No
4) A sample of 48 observations is selected from a normal population. The sample mean is 22, and the population standard deviation is 6.
Conduct the following test of hypothesis using the .05 significance level.
H0 : μ ≤ 21
H1 : μ > 21
A)
Is this a one- or two-tailed test?
B)
What is the decision rule? (Round your answer to 2 decimal places.)
H0 and H1 when z >
C)
What is the value of the test statistic? (Round your answer to 2 decimal places.)
Value of the test statistic
D)
What is your decision regarding H0?
There is evidence to conclude that the population mean is greater than 21.
E)
What is the p-value? (Round your answer to 4 decimal places.)
5) Most air travelers now use e-tickets. Electronic ticketing allows passengers to not worry about a paper ticket, and it costs the airline companies less to handle than paper ticketing. However, in recent times the airlines have received complaints from passengers regarding their e-tickets, particularly when connecting flights and a change of airlines were involved. To investigate the problem an independent watchdog agency contacted a random sample of 20 airports and collected information on the number of complaints the airport had with e-tickets for the month of March. The information is reported below.
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...
Esitmates for year 201620162015Sales (units) increase.docxYASHU40
Esitmates for year 2016
2016
2015
Sales (units) increase
10%
115,000
Sale Price (unit) increase
1%
$5.00
Raw material:
Price
DM - Plasitic (lb.)
$2.90
$3.00
DM - Wheel (wheel)
$0.03
$0.02
Labor cost:
wage rate (airplane)
$0.60
$88,775
total
MOH:
Indirect material (per airplane)
$0.005
Indirect labor (per airplane)
$0.003
utility
$850
factory depreciation
$1,000
$27,000
total
Period cost:
S&A expenses - variable (per airplane)
$0.01
S&A expenses - Fixed
$15,000
$130,000
total
Finished Goods:
beginning (units)
?
desired ending (units)
9%
of yearly sales
15,000
Account receivable
25%
23%
Account payable
25%
23%
Tax rate
30%
30%
Minimun bank account
$50,000
$50,000
What is the break-even in sales units for 2016?
What is the target sale in sales units for 2016 with a target profit of $200,000?
Assuming at the beginning of 2015, the company made the plan same as 2016. Find the quantity factors and price factors for 2015:
Prepare income statement using both variable costing method and absorption costing method for 2016
Prepare a flexible budget for 2016, with decrease 10% sales, same, and increase 10% sales
Prepare a Master Budget for 2016:
Sales budget
Production budget
DM purchases budget
DL cost budget
MOH cost budget
COGS budget
S&A budget
Cash budget
Account receivable
Account payable
Does the factory need to borrow money at the end of 2016?
MS1023 Business Statistics with Computer Applications Homework #4
Maho Sonmez [email protected] 1
MS1023 Business Statistics w/Comp Apps I
Homework #4 – Use Red Par Score Form
Chps. 9 & 10: 50 Questions Only
1. The first step in testing a hypothesis is to
establish a true null hypothesis and a false
alternative hypothesis.
a) True
b) False
2. In testing hypotheses, the researcher
initially assumes that the alternative
hypothesis is true and uses the sample data
to reject it.
a) True
b) False
3. The null and the alternative hypotheses
must be mutually exclusive and collectively
exhaustive.
a) True
b) False
4. Generally speaking, the hypotheses that
business researchers want to prove are stated
in the alternative hypothesis.
a) True
b) False
5. When a true null hypothesis is rejected,
the researcher has made a Type I error.
a) True
b) False
6. When a false null hypothesis is rejected,
the researcher has made a Type II error.
a) True
b) False
7. The rejection region for a hypothesis test
becomes smaller if the level of significance
is changed from 0.01 to 0.05.
a) True
b) False
8. Whenever hypotheses are established
such that the alternative hypothesis is "μ>8",
where μ is the population mean, the
hypothesis test would be a two-tailed test.
a) True
b) False
9. Whene ...
CHAPTER 81. Consider using the addition rule when simple outcome.pdfbhargavadrbrijrani
CHAPTER 8
1. Consider using the addition rule when simple outcomes are connected by the word
a) and.
b) if.
c) but.
d) or.
2. An entire set of probabilities always sums to
a) some non-negative number.
b) some number between zero and one.
c) some positive number.
d) one.
3. A random selection of registered voters within the state of Nevada guarantees that
a) at least some registered voters will be selected from Reno.
b) at least some registered voters will be selected from each county.
c) all registered voters have an equal chance of being selected.
d) all registered voters will be adequately represented.
4. The random assignment of subjects to two or more experimental groups tends to produce
groups that are
a) equal at the outset of the experiment.
b) similar at the outset of the experiment.
c) noticeably different at the outset of the experiment.
d) noticeably different at the end of the experiment.
5. The probability that any offspring of alcoholic parents will be alcoholic equals .20. Therefore,
assuming independent outcomes, the probability that two children of alcoholic parents both will
be alcoholic equals
a) .04
b) .10
c) .20
d) .40
6. Whether or not a sample is random depends entirely on the
a) outcome.
b) accuracy of the outcome.
c) size of the sample.
d) selection process.
7. Assume that in a statistics class the probability of receiving a grade of A equals .30 and the
probability of receiving a grade of B equals .30. The probability that a randomly selected student
from this class will receive a grade other than an A or a B equals
a) .09
b) .36
c) .40
d) .91
8. Statisticians often wish to determine whether random outcomes can be viewed as either
a) true or false.
b) real or theoretical.
c) biased or unbiased.
d) common or rare.
9. Assume that in a statistics class the probability of receiving a grade of A equals .30 and the
probability of receiving a grade of B equals .30. The probability that a randomly selected student
from this class will receive either an A or a B equals
a) .09
b) .30
c) .60
d) .90
10. Consider using the multiplication rule when simple outcomes are connected by the word
a) and.
b) if.
c) but.
d) or.
CHAPTER 9
11. A random sample of 100 college students is taken from the student body of a large university
Assume that, in fact, a population mean of 20 hours and a population standard deviation of 15
hours describe the weekly study estimates for the entire student body. About 68 percent of the
sample means in this sampling distribution should be between
a) 18.50 and 21.50 hours.
b) 16.50 and 20.50 hours.
c) 19 and 21 hours.
d) 17 and 23 hours.
12. A random sample of 100 college students is taken from the student body of a large university
Assume that, in fact, a population mean of 20 hours and a standard deviation of 15 hours
describe the weekly study estimates for the entire student body. Therefore, the sampling
distribution of the mean has a mean that
a) approximates 20 hours.
b) equals 20 hours.
c) lies within a.
For this assignment, students will need to observe the activities th.docxalfred4lewis58146
For this assignment, students will need to observe the activities that take place in a courtroom setting. Find a video on YouTube... Pay attention to the courtroom actors including the judge, jury, attorneys, and defendant. Complete a one page reflection of your experience. Provide details about the case/cases you heard and note if anything surprised you during your observation.
Use APA format for this assignment.
.
For this assignment, select a human service organization from .docxalfred4lewis58146
For this assignment, select a human service organization from a public, nonprofit, or government sector that you are familiar with, or one that you find interesting. You will use this organization to complete all of the course assignments. You must be able to access information about the organization’s governance, financial sources and practices, mission, population served, and its political and social landscape. Review all the assignments now to verify the types of information you will need about the organization in order to complete them.
The following list provides examples of acceptable types of organizations. You can select an organization of the types included on this list or propose another type of organization to your instructor. The organization must provide human service program services. The selected organization will be included in all your assignments, so you will look at leadership and collaboration practices for that organization through several areas of focus.
Possible Organization Types
City, county, or state human services or mental health programs.
State hospitals (Western State Hospital, Milwaukee County Hospital, or another state or county hospital in your area).
School-based human services or case management programs.
Private mental health organizations.
Employee assistance programs.
For-profit hospital or health care organizations (Humana, Kaiser-Permanente, Aurora, etcetera).
Catholic community services.
Lutheran Social Services.
.
For this Assignment, read the case study for Claudia and find tw.docxalfred4lewis58146
For this Assignment, read the case study for Claudia and find two to three scholarly articles on social issues surrounding immigrant families.
By Day 7
In a 2- to 4-page paper, explain how the literature informs you about Claudia and her family when assessing her situation.
Describe two social issues related to the course-specific case study for Claudia that inform a culturally competent social worker.
Describe culturally competent strategies you might use to assess the needs of children.
Describe the types of data you would collect from Claudia and her family in order to best serve them.
Identify other resources that may offer you further information about Claudia’s case.
Create an eco-map to represent Claudia’s situation. Describe how the ecological perspective of assessment influenced how the social worker interacted with Claudia.
Describe how the social worker in the case used a strengths perspective and multiple tools in her assessment of Claudia. Explain how those factors contributed to the therapeutic relationship with Claudia and her family.
Support your Assignment with specific references to the resources. Be sure to provide full APA citations for your references.
.
For this assignment, download the A6 code pack. This zip fil.docxalfred4lewis58146
For this assignment, download the
A6 code pack
. This zip file contains several files:
main.cpp
- the predetermined main.cpp. This file shows the usage and functionality that is expected of your program. You are not allowed to edit this file. You will not be submitting this file with your assignment.
CMakeLists.txt
- the preset CMake file to build with your functions files.
input/greeneggsandham.txt
- the contents of Green Eggs and Ham in text format.
input/aliceChapter1.txt
- the first chapter of Alice in Wonderland in text format.
output/greeneggsandham.out
- the expected output when running your program against the
greeneggsandham.txt
file
output/aliceChapter1.out
- the expected output when running your program against the
aliceChapter1.txt
file
Your task is to provide the implementations for all of the referenced functions. You will need to create two files:
functions.h
and
functions.cpp
to make the program work as intended.
You will want to make your program as general as possible by not having any assumptions about the data hardcoded in. Two public input files have been supplied with the starter pack. We will run your program against a third private input file.
Function Requirements
The requirements of each function are given below. The input, output, and task of each function is described. The functions are:
promptUserForFilename()
openFile()
readWordsFromFile()
removePunctuation()
capitalizeWords()
filterUniqueWords()
alphabetizeWords()
countUniqueWords()
printWordsAndCounts()
countLetters()
printLetterCounts()
printMaxMinWord()
printMaxMinLetter()
promptUserForFilename()
Input
: None
Output
: A string
Task
: Prompt the user to enter a filename.
openFile()
Input
: (1) The input file stream (2) The string filename to open
Output
: True if the file successfully opened, False if the file could not be opened
Task
: Open the input file stream for the corresponding filename. Check that the file opened correctly. The string filename will remain unchanged.
readWordsFromFile()
Input
: The input file stream
Output
: A vector of strings
Task
: Read all of the words that are in the filestream and return a list of all the words in the order present in the file.
removePunctuation()
Input
: (1) A vector of strings (2) A string of all the punctuation characters to remove
Output
: None
Task
: For each word in the vector, remove all occurrences of all the punctuation characters denoted by the punctuation string. When complete, the input vector will now hold all the words with punctuation removed. The punctuation string will remain unchanged.
capitalizeWords()
Input
: A vector of strings
Output
: None
Task
: For each word in the vector, convert each character to its upper case equivalent. When complete, the input vector will now hold all the words capitalized.
filterUniqueWords()
Input
: A vector of strings
Output
: A vector of strings
Task
: The function will return only th.
For this assignment, create infographic using the Canva website..docxalfred4lewis58146
For this assignment, create infographic using the Canva website. Pictorially and using short phrases, depict the way in which an organization you are affiliated (Charter School) with celebrates its achievements.
Next, identify research conducted that supports and emphasizes the importance of leaders’ taking the time to celebrate. How does a leader’s taking the time to recognize victories and reinforce shared values enhance the culture and climate of an organization?
Then, explain how leaders could build upon or improve purposeful celebrations within the organization. Make sure that you utilize scholarly literature and document supportive research for the short phrases identified and used in your Canva infographic.
Length: 1 infographic and 2–3 page essay, not including references or title page.
References: Minimum of five scholarly resources
.
For this assignment, compare California during the Great Depression.docxalfred4lewis58146
For this assignment, compare California during the Great Depression and Great Recession. Provide historical details about California during the Great Depression. What did Californians go through? Think economic, social, political, etc., for the historical details. Describe (at least) one similarity and one difference between the two eras.
You may also compare the Great Depression to the economic problems caused by Covid-19 in 2020. Focus on California, not the United States.
Requirements: 500 words
Plagiarism check
.
For this assignment, create a 10- to 12-slide presentation in Mi.docxalfred4lewis58146
For this assignment, create a 10- to 12-slide presentation in Microsoft PowerPoint that addresses the following points:
What are the points of conflict between Sunni and Shia Muslims? Where do their interpretations of Islam differ significantly?
How and when did these conflicts come into existence?
In what ways do they share the same beliefs? Is antipathy toward the West an automatic position?
Identify which nations are predominantly Sunni and which are Shia. Illustrate with a map.
Provide an example of at least one significant terrorist action by each branch of Islam.
Discuss whether counterterrorism authorities should prepare differently for Sunni terrorism than they would for Shia terrorism.
.
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Midterm 2 – Practice Exercises
1
1. The amount of material used in making a custom sail for a sailboat is normally
distributed with a standard deviation of 64 square feet. For a random sample of 15
sails, the mean amount of material used is 912 square feet. Which of the following
represents a 99% confidence interval for the population mean amount of material
used in a custom sail?
A. 912 ± 49.2
B. 912 ± 42.6
C. 912 ± 44.3
D. 912 ± 46.8
2. The number of beverage cans produced each hour from a vending machine is
normally distributed with a standard deviation of 8.6. For a random sample of 12
hours, the average number of beverage cans produced was 326.0. Assume a 99%
confidence interval for the population mean number of beverage cans produced
per hour. Calculate the margin of error of the 99% confidence interval.
A. 1.85
B. 3.60
C. 6.41
D. 10.56
3. The number of beverage cans produced each hour from a vending machine is
normally distributed with a standard deviation of 8.6. For a random sample of 12
hours, the average number of beverage cans produced was 326.0. Assume a 99%
confidence interval for the population mean number of beverage cans produced
per hour. Find the upper confidence limit of the 99% confidence interval.
A. 340.25
B. 325.98
C. 319.59
D. 332.41
4. If we change a 95% confidence interval estimate to a 99% confidence interval
estimate, we can expect
A. the size of the confidence interval to increase
B. the size of the confidence interval to decrease
C. the size of the confidence interval to remain the same
D. the sample size to increase
Midterm 2 – Practice Exercises
2
5. If a sample has 20 observations and a 90% confidence estimate for µ is needed,
the appropriate t‐score is:
A. 2.120
B. 1.746
C. 2.131
D. 1.729
6. We are interested in conducting a study to determine what percentage of voters
would vote for the incumbent member of parliament. What is the minimum size
sample needed to estimate the population proportion with a margin of error of
0.07 or less at 95% confidence?
A. 200
B. 100
C. 58
D. 196
7. The sample size needed to provide a margin of error of 2 or less with a 0.95
confidence coefficient when the population standard deviation equals 11 is
A. 10
B. 11
C. 116
D. 117
8. The manager of the local health club is interested in determining the number of
times members use the weight room per month. She takes a random sample of 15
members and finds that over the course of a month, the average number of visits
was 11.2 with a standard deviation of 3.2. Assuming that the monthly number of
visits is normally distributed, which of the following represents a 95% confidence
interval for the average monthly usage of all health club members?
A. 11.2 ± 1.74
B. 11.2 ± 1.77
C. 11.2 ± 1.62
D. 11.2 ± 1.83
Midterm 2 – Practice Exercises
3
9. The s.
Midterm 2 – Practice Exercises
1
1. The amount of material used in making a custom sail for a sailboat is normally
distributed with a standard deviation of 64 square feet. For a random sample of 15
sails, the mean amount of material used is 912 square feet. Which of the following
represents a 99% confidence interval for the population mean amount of material
used in a custom sail?
A. 912 ± 49.2
B. 912 ± 42.6
C. 912 ± 44.3
D. 912 ± 46.8
2. The number of beverage cans produced each hour from a vending machine is
normally distributed with a standard deviation of 8.6. For a random sample of 12
hours, the average number of beverage cans produced was 326.0. Assume a 99%
confidence interval for the population mean number of beverage cans produced
per hour. Calculate the margin of error of the 99% confidence interval.
A. 1.85
B. 3.60
C. 6.41
D. 10.56
3. The number of beverage cans produced each hour from a vending machine is
normally distributed with a standard deviation of 8.6. For a random sample of 12
hours, the average number of beverage cans produced was 326.0. Assume a 99%
confidence interval for the population mean number of beverage cans produced
per hour. Find the upper confidence limit of the 99% confidence interval.
A. 340.25
B. 325.98
C. 319.59
D. 332.41
4. If we change a 95% confidence interval estimate to a 99% confidence interval
estimate, we can expect
A. the size of the confidence interval to increase
B. the size of the confidence interval to decrease
C. the size of the confidence interval to remain the same
D. the sample size to increase
Midterm 2 – Practice Exercises
2
5. If a sample has 20 observations and a 90% confidence estimate for µ is needed,
the appropriate t‐score is:
A. 2.120
B. 1.746
C. 2.131
D. 1.729
6. We are interested in conducting a study to determine what percentage of voters
would vote for the incumbent member of parliament. What is the minimum size
sample needed to estimate the population proportion with a margin of error of
0.07 or less at 95% confidence?
A. 200
B. 100
C. 58
D. 196
7. The sample size needed to provide a margin of error of 2 or less with a 0.95
confidence coefficient when the population standard deviation equals 11 is
A. 10
B. 11
C. 116
D. 117
8. The manager of the local health club is interested in determining the number of
times members use the weight room per month. She takes a random sample of 15
members and finds that over the course of a month, the average number of visits
was 11.2 with a standard deviation of 3.2. Assuming that the monthly number of
visits is normally distributed, which of the following represents a 95% confidence
interval for the average monthly usage of all health club members?
A. 11.2 ± 1.74
B. 11.2 ± 1.77
C. 11.2 ± 1.62
D. 11.2 ± 1.83
Midterm 2 – Practice Exercises
3
9. The s ...
1. (2 points)Two random samples are selected from two indepe.docxSONU61709
1. (2 points)
Two random samples are selected from two independent pop-
ulations. A summary of the samples sizes, sample means, and
sample standard deviations is given below:
n1 = 37, x̄1 = 52.4, s1 = 5.8
n2 = 48, x̄2 = 75, s2 = 10
Find a 92.5% confidence interval for the difference µ1− µ2
of the means, assuming equal population variances.
Confidence Interval =
Answer(s) submitted:
•
(incorrect)
2. (2 points) In order to compare the means of two popu-
lations, independent random samples of 238 observations are
selected from each population, with the following results:
Sample 1 Sample 2
x1 = 1 x2 = 3
s1 = 120 s2 = 200
(a) Use a 97 % confidence interval to estimate the difference
between the population means (µ1−µ2).
≤ (µ1−µ2)≤
(b) Test the null hypothesis: H0 : (µ1− µ2) = 0 versus the al-
ternative hypothesis: Ha : (µ1− µ2) 6= 0. Using α = 0.03, give
the following:
(i) the test statistic z =
(ii) the positive critical z score
(iii) the negative critical z score
The final conclustion is
• A. We can reject the null hypothesis that (µ1−µ2) = 0
and accept that (µ1−µ2) 6= 0.
• B. There is not sufficient evidence to reject the null hy-
pothesis that (µ1−µ2) = 0.
(c) Test the null hypothesis: H0 : (µ1−µ2) = 26 versus the al-
ternative hypothesis: Ha : (µ1−µ2) 6= 26. Using α = 0.03, give
the following:
(i) the test statistic z =
(ii) the positive critical z score
(iii) the negative critical z score
The final conclustion is
• A. We can reject the null hypothesis that (µ1−µ2) = 26
and accept that (µ1−µ2) 6= 26.
• B. There is not sufficient evidence to reject the null hy-
pothesis that (µ1−µ2) = 26.
Answer(s) submitted:
•
•
•
•
•
•
•
•
•
•
(incorrect)
3. (2 points) Two independent samples have been selected,
70 observations from population 1 and 83 observations from
population 2. The sample means have been calculated to be
x1 = 14.9 and x2 = 10.5. From previous experience with these
populations, it is known that the variances are σ21 = 20 and
σ22 = 21.
(a) Find σ(x1−x2).
answer:
(b) Determine the rejection region for the test of H0 :
(µ1−µ2) = 2.92 and Ha : (µ1−µ2)> 2.92 Use α = 0.05.
z >
(c) Compute the test statistic.
z =
The final conclustion is
• A. We can reject the null hypothesis that (µ1− µ2) =
2.92 and accept that (µ1−µ2)> 2.92.
• B. There is not sufficient evidence to reject the null hy-
pothesis that (µ1−µ2) = 2.92.
(d) Construct a 95 % confidence interval for (µ1−µ2).
≤ (µ1−µ2)≤
Answer(s) submitted:
•
•
•
•
•
•
(incorrect)
4. (2 points) Randomly selected 100 student cars have ages
with a mean of 7.2 years and a standard deviation of 3.4 years,
while randomly selected 85 faculty cars have ages with a mean
of 5.4 years and a standard deviation of 3.3 years.
1
1. Use a 0.01 significance level to test the claim that student
cars are older than faculty cars.
The test statistic is
The critical value is
Is there sufficient evidence to support the claim that student
cars are older than faculty cars?
• A. Yes
• ...
1) A sample of 10 observations is selected from a normal populatio.docxdorishigh
1) A sample of 10 observations is selected from a normal population for which the population standard deviation is known to be 6. The sample mean is 23. (Round your answers to 3 decimal places.)
A) The standard error of the mean is ________
B) The 99 percent confidence interval for the population mean is between _______and ________
2) The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 20 eggs per month with a standard deviation of 2.63 eggs per month (Round your answer to 3 decimal places.)
A) What is the best estimate of this value?
B) For a 99 percent confidence interval, the value of t is ______
C) The 99 percent confidence interval for the population mean is _______to ________
3) As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 230 applicants 26 failed the test.
A) Develop a 90 percent confidence interval for the proportion of applicants that fail the test. (Round your answers to 3 decimal places.)
For the applicants the confidence interval is between _______ and _______
B) Would it be reasonable to conclude that more than 11 percent of the applicants are now failing the test? Yes or No
C) In addition to the testing of applicants, Fashion Industries randomly tests its employees throughout the year. Last year in the 520 random tests conducted, 22 employees failed the test. Would it be reasonable to conclude that less than 6 percent of the employees are not able to pass the random drug test? Yes or No
4) A sample of 48 observations is selected from a normal population. The sample mean is 22, and the population standard deviation is 6.
Conduct the following test of hypothesis using the .05 significance level.
H0 : μ ≤ 21
H1 : μ > 21
A)
Is this a one- or two-tailed test?
B)
What is the decision rule? (Round your answer to 2 decimal places.)
H0 and H1 when z >
C)
What is the value of the test statistic? (Round your answer to 2 decimal places.)
Value of the test statistic
D)
What is your decision regarding H0?
There is evidence to conclude that the population mean is greater than 21.
E)
What is the p-value? (Round your answer to 4 decimal places.)
5) Most air travelers now use e-tickets. Electronic ticketing allows passengers to not worry about a paper ticket, and it costs the airline companies less to handle than paper ticketing. However, in recent times the airlines have received complaints from passengers regarding their e-tickets, particularly when connecting flights and a change of airlines were involved. To investigate the problem an independent watchdog agency contacted a random sample of 20 airports and collected information on the number of complaints the airport had with e-tickets for the month of March. The information is reported below.
14
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12
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15
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...
Esitmates for year 201620162015Sales (units) increase.docxYASHU40
Esitmates for year 2016
2016
2015
Sales (units) increase
10%
115,000
Sale Price (unit) increase
1%
$5.00
Raw material:
Price
DM - Plasitic (lb.)
$2.90
$3.00
DM - Wheel (wheel)
$0.03
$0.02
Labor cost:
wage rate (airplane)
$0.60
$88,775
total
MOH:
Indirect material (per airplane)
$0.005
Indirect labor (per airplane)
$0.003
utility
$850
factory depreciation
$1,000
$27,000
total
Period cost:
S&A expenses - variable (per airplane)
$0.01
S&A expenses - Fixed
$15,000
$130,000
total
Finished Goods:
beginning (units)
?
desired ending (units)
9%
of yearly sales
15,000
Account receivable
25%
23%
Account payable
25%
23%
Tax rate
30%
30%
Minimun bank account
$50,000
$50,000
What is the break-even in sales units for 2016?
What is the target sale in sales units for 2016 with a target profit of $200,000?
Assuming at the beginning of 2015, the company made the plan same as 2016. Find the quantity factors and price factors for 2015:
Prepare income statement using both variable costing method and absorption costing method for 2016
Prepare a flexible budget for 2016, with decrease 10% sales, same, and increase 10% sales
Prepare a Master Budget for 2016:
Sales budget
Production budget
DM purchases budget
DL cost budget
MOH cost budget
COGS budget
S&A budget
Cash budget
Account receivable
Account payable
Does the factory need to borrow money at the end of 2016?
MS1023 Business Statistics with Computer Applications Homework #4
Maho Sonmez [email protected] 1
MS1023 Business Statistics w/Comp Apps I
Homework #4 – Use Red Par Score Form
Chps. 9 & 10: 50 Questions Only
1. The first step in testing a hypothesis is to
establish a true null hypothesis and a false
alternative hypothesis.
a) True
b) False
2. In testing hypotheses, the researcher
initially assumes that the alternative
hypothesis is true and uses the sample data
to reject it.
a) True
b) False
3. The null and the alternative hypotheses
must be mutually exclusive and collectively
exhaustive.
a) True
b) False
4. Generally speaking, the hypotheses that
business researchers want to prove are stated
in the alternative hypothesis.
a) True
b) False
5. When a true null hypothesis is rejected,
the researcher has made a Type I error.
a) True
b) False
6. When a false null hypothesis is rejected,
the researcher has made a Type II error.
a) True
b) False
7. The rejection region for a hypothesis test
becomes smaller if the level of significance
is changed from 0.01 to 0.05.
a) True
b) False
8. Whenever hypotheses are established
such that the alternative hypothesis is "μ>8",
where μ is the population mean, the
hypothesis test would be a two-tailed test.
a) True
b) False
9. Whene ...
CHAPTER 81. Consider using the addition rule when simple outcome.pdfbhargavadrbrijrani
CHAPTER 8
1. Consider using the addition rule when simple outcomes are connected by the word
a) and.
b) if.
c) but.
d) or.
2. An entire set of probabilities always sums to
a) some non-negative number.
b) some number between zero and one.
c) some positive number.
d) one.
3. A random selection of registered voters within the state of Nevada guarantees that
a) at least some registered voters will be selected from Reno.
b) at least some registered voters will be selected from each county.
c) all registered voters have an equal chance of being selected.
d) all registered voters will be adequately represented.
4. The random assignment of subjects to two or more experimental groups tends to produce
groups that are
a) equal at the outset of the experiment.
b) similar at the outset of the experiment.
c) noticeably different at the outset of the experiment.
d) noticeably different at the end of the experiment.
5. The probability that any offspring of alcoholic parents will be alcoholic equals .20. Therefore,
assuming independent outcomes, the probability that two children of alcoholic parents both will
be alcoholic equals
a) .04
b) .10
c) .20
d) .40
6. Whether or not a sample is random depends entirely on the
a) outcome.
b) accuracy of the outcome.
c) size of the sample.
d) selection process.
7. Assume that in a statistics class the probability of receiving a grade of A equals .30 and the
probability of receiving a grade of B equals .30. The probability that a randomly selected student
from this class will receive a grade other than an A or a B equals
a) .09
b) .36
c) .40
d) .91
8. Statisticians often wish to determine whether random outcomes can be viewed as either
a) true or false.
b) real or theoretical.
c) biased or unbiased.
d) common or rare.
9. Assume that in a statistics class the probability of receiving a grade of A equals .30 and the
probability of receiving a grade of B equals .30. The probability that a randomly selected student
from this class will receive either an A or a B equals
a) .09
b) .30
c) .60
d) .90
10. Consider using the multiplication rule when simple outcomes are connected by the word
a) and.
b) if.
c) but.
d) or.
CHAPTER 9
11. A random sample of 100 college students is taken from the student body of a large university
Assume that, in fact, a population mean of 20 hours and a population standard deviation of 15
hours describe the weekly study estimates for the entire student body. About 68 percent of the
sample means in this sampling distribution should be between
a) 18.50 and 21.50 hours.
b) 16.50 and 20.50 hours.
c) 19 and 21 hours.
d) 17 and 23 hours.
12. A random sample of 100 college students is taken from the student body of a large university
Assume that, in fact, a population mean of 20 hours and a standard deviation of 15 hours
describe the weekly study estimates for the entire student body. Therefore, the sampling
distribution of the mean has a mean that
a) approximates 20 hours.
b) equals 20 hours.
c) lies within a.
For this assignment, students will need to observe the activities th.docxalfred4lewis58146
For this assignment, students will need to observe the activities that take place in a courtroom setting. Find a video on YouTube... Pay attention to the courtroom actors including the judge, jury, attorneys, and defendant. Complete a one page reflection of your experience. Provide details about the case/cases you heard and note if anything surprised you during your observation.
Use APA format for this assignment.
.
For this assignment, select a human service organization from .docxalfred4lewis58146
For this assignment, select a human service organization from a public, nonprofit, or government sector that you are familiar with, or one that you find interesting. You will use this organization to complete all of the course assignments. You must be able to access information about the organization’s governance, financial sources and practices, mission, population served, and its political and social landscape. Review all the assignments now to verify the types of information you will need about the organization in order to complete them.
The following list provides examples of acceptable types of organizations. You can select an organization of the types included on this list or propose another type of organization to your instructor. The organization must provide human service program services. The selected organization will be included in all your assignments, so you will look at leadership and collaboration practices for that organization through several areas of focus.
Possible Organization Types
City, county, or state human services or mental health programs.
State hospitals (Western State Hospital, Milwaukee County Hospital, or another state or county hospital in your area).
School-based human services or case management programs.
Private mental health organizations.
Employee assistance programs.
For-profit hospital or health care organizations (Humana, Kaiser-Permanente, Aurora, etcetera).
Catholic community services.
Lutheran Social Services.
.
For this Assignment, read the case study for Claudia and find tw.docxalfred4lewis58146
For this Assignment, read the case study for Claudia and find two to three scholarly articles on social issues surrounding immigrant families.
By Day 7
In a 2- to 4-page paper, explain how the literature informs you about Claudia and her family when assessing her situation.
Describe two social issues related to the course-specific case study for Claudia that inform a culturally competent social worker.
Describe culturally competent strategies you might use to assess the needs of children.
Describe the types of data you would collect from Claudia and her family in order to best serve them.
Identify other resources that may offer you further information about Claudia’s case.
Create an eco-map to represent Claudia’s situation. Describe how the ecological perspective of assessment influenced how the social worker interacted with Claudia.
Describe how the social worker in the case used a strengths perspective and multiple tools in her assessment of Claudia. Explain how those factors contributed to the therapeutic relationship with Claudia and her family.
Support your Assignment with specific references to the resources. Be sure to provide full APA citations for your references.
.
For this assignment, download the A6 code pack. This zip fil.docxalfred4lewis58146
For this assignment, download the
A6 code pack
. This zip file contains several files:
main.cpp
- the predetermined main.cpp. This file shows the usage and functionality that is expected of your program. You are not allowed to edit this file. You will not be submitting this file with your assignment.
CMakeLists.txt
- the preset CMake file to build with your functions files.
input/greeneggsandham.txt
- the contents of Green Eggs and Ham in text format.
input/aliceChapter1.txt
- the first chapter of Alice in Wonderland in text format.
output/greeneggsandham.out
- the expected output when running your program against the
greeneggsandham.txt
file
output/aliceChapter1.out
- the expected output when running your program against the
aliceChapter1.txt
file
Your task is to provide the implementations for all of the referenced functions. You will need to create two files:
functions.h
and
functions.cpp
to make the program work as intended.
You will want to make your program as general as possible by not having any assumptions about the data hardcoded in. Two public input files have been supplied with the starter pack. We will run your program against a third private input file.
Function Requirements
The requirements of each function are given below. The input, output, and task of each function is described. The functions are:
promptUserForFilename()
openFile()
readWordsFromFile()
removePunctuation()
capitalizeWords()
filterUniqueWords()
alphabetizeWords()
countUniqueWords()
printWordsAndCounts()
countLetters()
printLetterCounts()
printMaxMinWord()
printMaxMinLetter()
promptUserForFilename()
Input
: None
Output
: A string
Task
: Prompt the user to enter a filename.
openFile()
Input
: (1) The input file stream (2) The string filename to open
Output
: True if the file successfully opened, False if the file could not be opened
Task
: Open the input file stream for the corresponding filename. Check that the file opened correctly. The string filename will remain unchanged.
readWordsFromFile()
Input
: The input file stream
Output
: A vector of strings
Task
: Read all of the words that are in the filestream and return a list of all the words in the order present in the file.
removePunctuation()
Input
: (1) A vector of strings (2) A string of all the punctuation characters to remove
Output
: None
Task
: For each word in the vector, remove all occurrences of all the punctuation characters denoted by the punctuation string. When complete, the input vector will now hold all the words with punctuation removed. The punctuation string will remain unchanged.
capitalizeWords()
Input
: A vector of strings
Output
: None
Task
: For each word in the vector, convert each character to its upper case equivalent. When complete, the input vector will now hold all the words capitalized.
filterUniqueWords()
Input
: A vector of strings
Output
: A vector of strings
Task
: The function will return only th.
For this assignment, create infographic using the Canva website..docxalfred4lewis58146
For this assignment, create infographic using the Canva website. Pictorially and using short phrases, depict the way in which an organization you are affiliated (Charter School) with celebrates its achievements.
Next, identify research conducted that supports and emphasizes the importance of leaders’ taking the time to celebrate. How does a leader’s taking the time to recognize victories and reinforce shared values enhance the culture and climate of an organization?
Then, explain how leaders could build upon or improve purposeful celebrations within the organization. Make sure that you utilize scholarly literature and document supportive research for the short phrases identified and used in your Canva infographic.
Length: 1 infographic and 2–3 page essay, not including references or title page.
References: Minimum of five scholarly resources
.
For this assignment, compare California during the Great Depression.docxalfred4lewis58146
For this assignment, compare California during the Great Depression and Great Recession. Provide historical details about California during the Great Depression. What did Californians go through? Think economic, social, political, etc., for the historical details. Describe (at least) one similarity and one difference between the two eras.
You may also compare the Great Depression to the economic problems caused by Covid-19 in 2020. Focus on California, not the United States.
Requirements: 500 words
Plagiarism check
.
For this assignment, create a 10- to 12-slide presentation in Mi.docxalfred4lewis58146
For this assignment, create a 10- to 12-slide presentation in Microsoft PowerPoint that addresses the following points:
What are the points of conflict between Sunni and Shia Muslims? Where do their interpretations of Islam differ significantly?
How and when did these conflicts come into existence?
In what ways do they share the same beliefs? Is antipathy toward the West an automatic position?
Identify which nations are predominantly Sunni and which are Shia. Illustrate with a map.
Provide an example of at least one significant terrorist action by each branch of Islam.
Discuss whether counterterrorism authorities should prepare differently for Sunni terrorism than they would for Shia terrorism.
.
For this assignment, begin by reading chapters 12-15 in Dr. Bells t.docxalfred4lewis58146
For this assignment, begin by reading chapters 12-15 in Dr. Bell's text. Then, consider and respond to the following questions.
The SALT talks accomplished little, but it was important to keep both parties talking. Does the evidence of the 1970s and 1980s support this thesis? Support your opinion with at least three examples.
Critics of "Star Wars" argued that an effective nuclear defense shield would have increased the dangers of nuclear war. How so?
During much of the 1970s, the Soviets became increasingly dependent on US grain in order to feed their people. These exports were popular with American farmers, but played a more ambiguous role in American efforts to control the Soviets. If you had been a presidential advisor for Presidents Ford and Carter, what economic strategy would you have recommended?
The Soviet invasion and occupation of Afghanistan has been described as the Soviets’ Vietnam. Discuss at least three similarities and one dissimilarity between these conflicts.
.
For this assignment, assume you are the new Secretary of Homelan.docxalfred4lewis58146
For this assignment, assume you are the new Secretary of Homeland Security. You are drafting a Policy Document referred to as a “White Paper” for the Biden Administration to highlight the impact of open/closed borders in the age of COVID-19 on migration, asylum seekers, and economic recovery. In this white paper, consider the following to frame your paper.
Define what YOU believe an “OPEN” vs “CLOSED” border means especially when dealing with those seeking asylum. Reminder that you can provide your opinion without using “I think” or something similar.
How do you believe illegal migrants can be treated humanely and with dignity/inclusion?
How does an “open” vs a “closed” border impact the United States economy?
What are your recommendations for the next 12-24 months on specific steps that the new administration needs to take?
DO NOT answer this as if it is a four Question Exam. This is a WHITE PAPER and is a single narrative framed by these questions, but do NOT use first person (I statements).
.
For this assignment, address the following promptsIntroductor.docxalfred4lewis58146
For this assignment, address the following prompts:
Introductory paragraph to topic about unemployment.
Write an introductory paragraph with at least 150 words that clearly explains the topic, the importance of further research, and ethical implications.
My thesis statement:
Unemployment and lack of economic opportunity have social consequences creating anxiety and added stress because it allows for reduced economic growth and directly influences our society's mental, physical, and emotional well-being
(A thesis statement should be a concise, declarative statement. The thesis statement must appear at the end of the introductory paragraph.)
Annotated bibliography.
Develop an annotated bibliography to indicate the quality of the sources you have read.
Summarize in your own words how the source contributes to the solution of the global societal issue for each annotation.
Address fully the purpose, content, evidence, and relation to other sources you found on this topic (your annotation should be one to two paragraphs long—150 words or more.
Include no less than five scholarly sources in the annotated bibliography that will be used to support the major points of the Final Paper.
Demonstrate critical thinking skills by accurately interpreting evidence used to support various positions of the topic.
.
For this assignment, analyze the play by focusing on one of the .docxalfred4lewis58146
For this assignment, analyze the play by focusing on
one
of the following characters: Cassio, Desdemona, Othello, or Iago. Explore the motives, emotions and circumstances of the character you choose, and his or her relationships with all the other significant characters in the play. Try to give your reader a good sense of why things play out as they do. Each of these characters has significant interactions with all the others, and you will end up discussing them all no matter which one you choose to focus on. But try to explain what happens in
Othello
by following the trajectory of a single character throughout the entire play. As always, use short but effective quotations from the play to point out significant words and actions, but focus mainly on your explanations of what the words and deeds mean and why we should agree with your analysis.
To cite the text, place
A
ct,
S
cene, and
L
ine numbers in parentheses at the end of your quotation. Example: “Your quotation here” (1.3.5).
.
For this assignment I would like you to answer these questions.docxalfred4lewis58146
For this assignment I would like you to answer these questions
1. Explain what a black hole is, describe its characteristics (size, mass), and give a detailed explanation on how they form. Make sure to explain what the Schwarzschild radius and event horizon are. Describe the two types of black holes.
2. Describe the observational evidence for black holes that are discussed in Chapter 15.
Bonues: Do a little research on the Internet (read a few articles) and summarize how astronomers were able to make this image of a black hole. This came out in April 2019.
.
For the Weekly Reports I need 2 reports. For the First two weeks the.docxalfred4lewis58146
For the Weekly Reports I need 2 reports. For the First two weeks they need to do the weekly report and each report must be a minimum of one page.
For the Final Report Its only 1, But it's pretty much putting all the weeks together to do one final report. It needs to be minimum 2 pages
.
For the shortanswer questions,you will need to respo.docxalfred4lewis58146
For the
short
answer questions,
y
ou will need to respond to 7
of the questions
provided (bellow). Each answer should be around
200 words
. Your answers should provide evidence of engagement with and understanding of the key concepts about identity, alienation, rationality, and power.
Your answers should be expressed in academic English.
You will not be able to use direct quotations from the readings or lecture material.
Explain concepts in your own words; if you cannot clearly explain an idea/concept in your own words, you probably haven’t yet fully grasped its meaning.
To what extent can identities be said to be "integral" to a person (i.e. is a particular identity an essential feature of who you are)?
When thinking sociologically about identity, subject positions are associated with roles learned through socialisation. Explain how individuals learn those roles through socialisation?
According to Benedict Andersen the nation is a cultural artefact and an imagined community. What did he mean by this and what are key means through which the nation is imagined?
Marx described “alienation” as an outcome of capitalist economic relations. Sociologists have since expanded the concept to think about how it might relate to other social processes (i.e. “social alienation”). In what other ways might we be said to experience alienation in society?
Gramsci understood hegemony as a form of rule in which subordinate groups consent to the exercise of power or domination. According to Gramsci how does hegemony operate in capitalist societies?
Weber saw rationalisation as an “iron cage” that increasingly dominated all social life. Discuss how rationalisation shapes higher education.
According to Marxists how do relationships of power operate in capitalist societies?
According to Foucault how does modern disciplinary power differ from traditional sovereign power? (e.g. as exercised by monarchs, kings and emperors)
.
For the sake of argument (this essay in particular), lets prete.docxalfred4lewis58146
For the sake of argument (this essay in particular), let's pretend that
Sophia (Links to an external site.)
has discovered a fundamental truth about our concept of the soul: that it is, as she defined it,
the mind's essence
.For this essay, I'd like you to first take a deep dive into
defining
and
elaborating
on what that might mean
(to Sophia, then, as a consequence, to humanity) Then, I'd like you to take into consideration the technologies that have had the greatest impact on how the soul-as-mind's-essence idea expresses itself in our era. Can we have a "virtual afterlife"? A "digital soul"? Can we beat death? If we create nonbiological entities into which we put our identities, and, thus, that entity "thinks" and "feels" like it is "you," well, to what degree can we say that it is "you" and that it is a contemporary version of how Sophia defines the soul? Furthermore, do you think that is what Sophia means--a digital simulacrum of the self? I am hoping you consider how our civilization's ideas are profoundly influenced by our technological world, and that these philosophical questions only exist in the first place because we have invented tools that inevitably create problems for and probe into the most sacred spaces of human identity.
This essay should be 4.5 pages minimum and, as usual, MLA format.
.
For the proposal, each student must describe an interface they a.docxalfred4lewis58146
For the proposal, each student must describe an interface they are interested in exploring and developing. The interface can be screen-oriented or other. It may be multi-model, web-based, mobile, etc. Please describe the interface, its intended target audience, and the data collection method you think is most appropriate for developing this system.
Your proposal should be between 1 and 2 pages. Submit the proposal in a word document
.
For the project, you will be expected to apply the key concepts of p.docxalfred4lewis58146
For the project, you will be expected to apply the key concepts of program evaluation to conduct a comprehensive evaluation, using quantitative and qualitative methods, of a health behavior change intervention among residents of a rural or underserved community. Essentially, you will develop, implement and evaluate a small-scale health behavior change intervention among 5-10 individuals residing in a rural or underserved community. You will be asked to choose a specific health behavior (e.g. healthy eating, physical activity, stress management, getting adequate sleep, increased water consumption, following dental hygiene recommendations, reducing distracted driving, etc.) that you can feasibly promote for a duration of two weeks. You may ask family members, friends, co-workers, neighbors or other individuals who you interact with on a regular basis to participate in your intervention as long they reside in a rural or underserved community. The intervention may occur via social media (e.g. posting health education messages on a Facebook page and/or facilitating discussion of health behavior among participants on Facebook), print media, email interaction, phone conversations, text messages, or in person; you may also employ a combination of these techniques. The focus of this project will be on the evaluation of the intervention. You will be expected to identify which evaluation questions you will be exploring, use both quantitative and qualitative methods to collect data, and analyze and interpret your qualitative data. You will be required to submit all of your data as well as expound on the development, implementation and evaluation of your health behavior change intervention in a paper.
should be
4-6 pages and double-spaced using 12- pt. Times Roman or Arial font with 1- inch page margins
.
Please see the following document regarding the required content of the paper:
Required Content for Evaluation Project Paper-1.pdf
.
For the past several weeks you have addressed several different area.docxalfred4lewis58146
For the past several weeks you have addressed several different areas of telecommunications and information technology in relation to different types of communication across the organizational footprint of Sunshine Health Corporation. Review the work you have done and formulate the Network Security Plan to be implemented across the network footprint. This is not to be an overly detailed report but to address different network concerns and recommendations for improving and securing organizational data, personnel records, intellectual property, and customer records.
Please address the narrative plan as well as a network diagram (no IP addresses, or circuit data required) and what is being done to secure the network at different levels of the OSI model and the organizational structure. Please make sure that you bring in a minimum of two external sources to strengthen and support your presentation.
The assignment should be 5-6 pages of content not counting title page, reference page or appendices (diagrams, budget sheet, equipment list, etc.). Please follow APA format.
Note: it is suggested that as you are reviewing your previous assignments in order to complete this assignment, also be making modifications and refining your previous work in order to successfully complete the week seven assignment, which is a final project report.
.
For the Mash it Up assignment, we experimented with different ways t.docxalfred4lewis58146
For the Mash it Up assignment, we experimented with different ways to use existing digital media in unexpected ways to generate something meaningful. What does this express about our relationship with digital media? We use popular digital platforms to expand the ways that we can express ourselves, but can they constrain our self-expression?
.
For the first time in modern history, the world is experiencing a he.docxalfred4lewis58146
For the first time in modern history, the world is experiencing a health system crisis through the current coronavirus known as (COVID-19), which has put the international financial market and economy, like never before, under cut-throat pressures. In light of your understanding of accounting and finance, please discuss how you and the world should assess the impacts of COVID-19, from the financial, social, educational, and ethical viewpoint.
1 page
.
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
How to Add Chatter in the odoo 17 ERP ModuleCeline George
In Odoo, the chatter is like a chat tool that helps you work together on records. You can leave notes and track things, making it easier to talk with your team and partners. Inside chatter, all communication history, activity, and changes will be displayed.
The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
MATATAG CURRICULUM: ASSESSING THE READINESS OF ELEM. PUBLIC SCHOOL TEACHERS I...NelTorrente
In this research, it concludes that while the readiness of teachers in Caloocan City to implement the MATATAG Curriculum is generally positive, targeted efforts in professional development, resource distribution, support networks, and comprehensive preparation can address the existing gaps and ensure successful curriculum implementation.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
Executive Directors Chat Leveraging AI for Diversity, Equity, and InclusionTechSoup
Let’s explore the intersection of technology and equity in the final session of our DEI series. Discover how AI tools, like ChatGPT, can be used to support and enhance your nonprofit's DEI initiatives. Participants will gain insights into practical AI applications and get tips for leveraging technology to advance their DEI goals.
Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
Thinking of getting a dog? Be aware that breeds like Pit Bulls, Rottweilers, and German Shepherds can be loyal and dangerous. Proper training and socialization are crucial to preventing aggressive behaviors. Ensure safety by understanding their needs and always supervising interactions. Stay safe, and enjoy your furry friends!
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
Page 1 of 10 ClassTime_______________Day_____________.docx
1. Page 1 of 10
Class Time_______________
Day_____________________
School of Business
Business Statistics I
Exam 5
Print out this test. Do all your calculations on
the test and mark your final
answer on the scantron sheet(answer sheet. If
you don’t have a scantron sheet,
one will be provided in the class.Turn‐in both your
test and the answer sheet. Do
not forget to writeyour name, Id#, and class time on
both the answer sheetand
the test.
Name____________________________________ID #________
______
1.
Suppose a random sample of 36 items is selected from a populat
ion. The population
standard deviation is known to be 10. The standard error of the
mean would be:
2. (a) 1.333
(b) 1.667
(c) 3.667
(d) 2.333
(e) 1.875
2.
From 100 homes of similar sizes, a sample of 25 homes is select
ed to study the average
home heating cost during the winter months. Suppose the heatin
g cost is known to be
normally distributed with mean of $220 per month for the four
months of winter and
standard deviation of $45. If the 100 homes represent the popula
tion size, the standard
error of the heating cost would be:
(a) 9.00
(b) 8.75
(c) 3.66
(d) 7.83
(e) 1.87
3. Suppose n=64 measurements is selected from a
population with mean and
standard
. The Z‐score corresponding to a value of would be:
(a) 2.0
(b) 3.0
(c) ‐2.5
(d) ‐2.0
Page 2 of 10
3. (e) 1.5
4.
A random sample of n=100 observations is selected from a popu
lation with and
standard The probability that is
(a) 0.8236
(b) 0.8936
(c) 0.9036
(d) 0.9983
(e) 0.8944
5.
A random sample of n=100 observations is selected from a popu
lation with and
standard The probability that (22.1 26.8)p
is
(a) 0.0434
(b) 0.0228
(c) 0.0036
(d) 0.0983
(e) 0.0944
6.
A random sample of size 36 is drawn from a population with me
If 86% of
the time the sample mean is less than 281, then the
population standard deviation
would be:
(a) 16.67
(b) 12.67
(c) 11.12
4. (d) 13.33
(e) 19.67
7.
A random sample of size n=81 is drawn from population with m
ean equal to 50 and
standard deviation 25. The expected value of the mean ( )iE x
and the standard
error
x
(a) 50 and 2.95
(b) 50 and 2.78
(c) 28 and 1.72
(d) 50 and 15.00
(e) 80 and 12.0
8.
According to a recent news report, the average price of gasoline
is $3.80 per gallon
(March 2011). This price can be considered as the nationwide p
opulation mean price
per gallon. Suppose that the standard deviation of the
gasoline price per gallon is
$0.50. A sample of 49 gas stations in Salt Lake City is taken. T
he probability that the
sample mean price is within ±0.10 of the population mean is
(a) 0.9236
(b) 0.8384
(c) 0.9544
(d) 0.9983
5. Page 3 of 10
(e) 0.8764
9. A finite population is normally distributed with mean
and standard deviation
. Suppose a sample of size 49 is taken so that the sample mean
x can be used to
estimate the population mean
The probability that the sample mean is less than or
equal to 48 or,
if the size of the finite population is N=150
(a) 0.1236
(b) 0.2420
(c) 0.1544
(d) 0.1983
(e) 0.1292
10.
The average life of a battery used in newly designed electric car
s is 150 hours with a
standard deviation of 20 hours. Suppose these values are true fo
r all batteries of this
type so that these values can be considered true for the populati
on with μ = 150 and σ
= 20. If a sample of size 50 is selected, the probability that the
sample mean life is
within ± 5 of the population mean (between 145 and 155 hours)
is
(a) 0.8236
(b) 0.9420
(c) 0.9544
(d) 0.9232
(e) 0.1292
6. 11.
The production manager of a bottling plant has acquired new ma
chines to fill beverage
cans. These machines are used to fill 16 ounce cans in one of th
eir production lines. If
the filling machine
is working properly, the mean fill volume should be 16.0
ounces
with a standard deviation of 0.30 ounces. If mean fill volume in
the cans is over 16.2
ounces or below 15.8 ounces, then an over filling or under fillin
g occurs. To avoid over
or under filling the production manager randomly selects
a sample of 9 cans
periodically and checks the volume. If the average content is les
s than 15.8 ounces or
more than 16.2 ounces, the production manager must stop
the line to make
adjustments. The probability of stopping the line based on the i
nformation above is:
(a) 0.0236
(b) 0.0376
(c) 0.0400
(d) 0.0456
(e) None of the above
12.
A new Rasmussen Report national telephone survey finds that
just 32% of American
Adults favor “sin taxes” on soda and junk foods. The survey wa
s based on a sample of
1,000 American Adults. Based on this survey data, the standard
7. deviation of p or the
standard error of sample proportion would be (considering
(a) 0.0176
(b) 0.0200
(c) 0.0196
(d) 0.0148
Page 4 of 10
(e) 0.0138
13. Based on a report, 55% of the voters believe that the
nation’s current economic
problems are the result of recession that started during the Bush
administration. A
new Rasmussen Reports national telephone survey finds that 51
% of likely voters say
the nation’s current economic problems are due to the recession
which began under
the administration of George Bush. This survey was based on 1,
000 likely voters and
was conducted on March 18‐19, 2011 by Rasmussen
Reports. Based on this survey
report, the probability that the sample proportion is lower than
51% is approximately
(a) 0.0076
(b) 0.0200
(c) 0.0055
(d) 0.0098
(e) 0.0128
8. 14.
According to a newly published report approximately 43% of ad
ults say filing their
tax paperwork is worse than a trip to the dentist. If a random sa
mple of 200 is
chosen, the probability that at least 90 of them share this opinio
n is
(a) 0.2076
(b) 0.3200
(c) 0.0155
(d) 0.2843
(e) 0.3128
15. A study about the students graduating within 4 years
of their entrance to the
universities indicated that 62% of the students do not
graduate within 4 years.
Suppose a random sample of 500 students was taken. The sampl
e considered the
students after 4 years of their college entrance. The probability
that fewer than 285
graduated within 4 years is
(a) 0.4893
(b) 0.9893
(c) 0.0107
(d) 0.0584
(e) 0.0628
16. Historically, a production line produces 6% defective
items. The production
supervisor takes a sample of 100 items frequently and if he find
s 8 or more defective
products, he stops the line to make adjustments. The
probability that a random
9. sample of 100 would lead to the stoppage of the production line
is:
(a) 0.2995
(b) 0.3893
(c) 0.2005
(d) 0.4584
(e) 0.7995
17. In simple random sampling
(a) Every sample has equal probability being selected
(b) Every sample is drawn at a pre‐specified time
Page 5 of 10
(c) Every item in the sample has equal probability
(d) None of the above is correct
(e) Only (a) and (c) are correct
18.
From a population of size 8 (N=8), all possible samples of size
3 (n=3) that can be drawn
are:
(a) 24
(b) 15
(c) 10
(d) 56
(e) 86
19.
A confidence interval for the mean is determined using the follo
wing formula
10. 1.28x
n
The confidence level being used in the above interval is
(a) 95%
(b) 98%
(c) 99%
(d) 67%
(e) 80%
20.
A confidence interval for the mean is determined using the follo
wing formula
0.99x
n
The confidence level being used in the above interval is
(a) 95.52%
(b) 98.32%
(c) 33.89%
(d) 67.78%
(e) 80.56%
21.
11. In a confidence interval, increasing the confidence level while k
eeping the sample size
fixed
(a) increases the width of the confidence interval.
(b) leaves the confidence interval unchanged.
(c) makes the confidence interval estimate more precise.
(d) makes the confidence interval estimate more reliable.
(e) decreases the width of the confidence interval.
22. The general form of a confidence interval is
(a) Point estimate ± standard error.
(b) Mean ± standard error of the mean.
(c) Mean ± the margin of error.
(d) Point estimate ± the margin of error.
Page 6 of 10
(e) Estimate ± the margin of error.
23. A random sample of n measurements is selected from
a population with unknown
mean and known standard deviation
. A 95% confidence interval for when
200, 102, 4.69n x be
(a) 104.35 and 15.65.
(b) 103.76 and 134.24
(c) 101.35 and 102.65
(d) 108.56 and 120.44
(e) 118.25 and 123.75
24. A random sample of size 20 produced a sample mean
and a standard
12. deviation
A 80% confidence interval using a t‐distribution is to be constr
ucted.
The t‐ value for the interval would be
(a) 1.711
(b) 2.064
(c) 2.038
(d) 1.328
(e) 2.485
25.
In constructing a confidence interval with known population sta
ndard deviation the
sample size is increased from n=36 to n=144 while the confiden
ce level is held fixed at
95%. This will
(a)
increase the width of the confidence interval making the estimat
e less precise.
(b)
decrease the width of the confidence interval making the estimat
e less precise.
(c) leave the width of the confidence interval unchanged.
(d) double the width of the confidence interval.
(e)
decrease the width of the confidence interval making the estimat
e more precise.
26. In constructing a confidence interval with known
population standard deviation
the sample size is increased from n=64 to n=256 while the conf
idence level is
held fixed at 95%. This will
(a) decrease the width of the confidence interval by 75%.
(b) leave the width of the confidence interval unchanged.
13. (c) double the width of the confidence interval.
(d) reduce the width of the interval to one‐half.
(e) Increase the width of the interval by 100%.
27.
The length of time that a space rocket component functions is a
pproximately normally
distributed. A sample of 20 of these components showed a mean
of hours
with a standard deviation
hours. A 95% confidence interval for the mean time
that the component will function is to be constructed. The margi
n of error would be
(a) 42.9
(b) 40.7
(c) 81.4
(d) 34.2
(e) Can’t be determined
Page 7 of 10
28.
The length of time that a space rocket component functions is a
pproximately normally
distributed. A sample of 20 of these components showed a mean
of hours
with a standard deviation
hours. A 95% confidence interval for the mean time
that the component will function
(a) 824.94 to 927.06
(b) 724.94 to 927.46
(c) 823.45 to 928.55
14. (d) 859.3 to 940.7
(e) 824.00 to 927.06
29.
The standard deviation of the test scores on a certain college pla
cement test is known
to be 12.5. A random sample of 81 students had a mean
score of 86.8. A 90%
confidence interval estimate for the average score of all student
s is
(a) 82.94 to 92.06
(b) 84.52 to 89.08
(c) 82.45 to 92.55
(d) 85.32 to 94.68
(e) 84.00 to 92.70
30. Which of the following statement is true for
constructing the confidence interval
estimate for the population mean
(a)
higher is the confidence interval, wider is the confidence interv
al for a fixed sample
size.
(b)
larger is the sample standard deviation, wider is the confidence
interval when the
sample size and confidence level are fixed
(c) in cases where the population standard deviation is
known, the appropriate
15. distribution to use to construct the interval is the normal distrib
ution.
(d) In a confidence interval, the margin of error gets
larger as the sample size is
increased.
(e) all of the above statements are true.
31.
The average life of a sample of 30 car tires was found to be 60,0
00 miles. It is known
that the
lifetimes of such tires are normally distributed with a standard d
eviation of
7,500 miles. A 95% confidence interval estimate of the mean lif
e of all such tires was
calculated. The width of this confidence interval is
(a) 5937
(b) 5368
(c) 6357
(d) 5731
(e) 5846
32.
The Nielsen Company reported that as of the third quarter of 20
10, 28 percent of U.S.
mobile subscribers now have smart phones, cell phones
with operating systems
Page 8 of 10
16. resembling those of computers. The growing popularity of smart
phones like Apple’s
iPhone, RIM’s Blackberry devices and a variety of Google Andr
oid‐based models on the
market, has accelerated the adoption rate. Among those
who acquired a new cell
phone in the past six months, 41 percent opted for a
Smartphone over a standard
feature phone. A sample of 850 high school students was asked
if they had a smart
phone. An overwhelming 578 indicated that they had a smart ph
one. The margin of
error at a 95% confidence would be
(a) 0.02
(b) 0.05
(c) 0.03
(d) 0.09
(e) 0.06
33.
Approximately 51 percent of the U.S. population has at least tw
o credit cards. (Source:
Experian national score index study, February 2007). Suppose a
study of 500 consumers
showed that 315 carried three or more credit cards. A 95% conf
idence interval for the
proportion of U.S. population who carried three or more credit c
ards would be
(a) 0.588 to 0.734
(b) 0.598 to 0.689
(c) 0.633 to 0.732
(d) 0.588 to 0.672
(e) 0.355 to 0.896
17. 34.
The following expressions are for the confidence intervals for th
e mean:
20
100 (2.0)
100
20
100 (2.0)
400
Note that the difference between the two intervals is that the sa
mple size in the second
interval is four times large compared to the first interval. What i
s the effect on the width
of the confidence interval of quadrupling the sample size
while holding all the other
data fixed?
18. (a) increase the width of the confidence interval by 75%.
(b) increase the width of the confidence interval by one‐half.
(c) decease the width of the confidence interval to one‐third.
(d) leave the width of the confidence interval unchanged.
(e) reduce the width of the confidence interval by one one‐half.
Page 9 of 10
35.
A quality engineer is interested in estimating the mean time req
uired to assemble a bar
code scanner. If the engineer wishes to be 95% confident that th
e error in estimating
the mean time is less than 0.25 minutes, and she knows from the
past experience that
the standard deviation of the assembly time is 0.75 minutes; the
sample size she would
need is
(a) 20
(b) 24
(c) 25
(d) 35
(e) 30
36.
The required sample size to estimate the mean for an a particula
r study resulted into
significantly large sample size. The analyst believes that he doe
s not have the time or
the resources to collect such a large sample. Which of the follo
19. wing actions would lead
to a reduced sample size?
(a)
the margin of error required in the actual study should be increa
sed.
(b) the confidence level should be reduces.
(c) the variation in the population should be reduced.
(d) all of the above will lead to a reduced sample size.
37. A large hospital wants to estimate the mean time
before the patients are attended
upon arrival to the hospital emergency room. From a past study,
it is known that the
standard deviation of the waiting time is 12 minutes. If
the hospital administration
wishes to estimate the mean time within 3 minutes with a 95% c
onfidence, the sample
size needed will be
(a) 107
(b) 190
(c) 500
(d) 62
(e) 290
38.
A manufacturer of plasma TVs has problems with excessive cust
omer complaints and
consequent return of the product for repair or
replacement. The quality control
department wants to determine the magnitude of the problem so
that it can estimate
its warranty liability. The number of
plasma TVs the quality engineer should sample
and inspect in order to estimate the fraction defective, p
within 2% with a 95%
20. confidence would be
(a) 2500
(b) 2401
(c) 3000
(d) 2000
(e) 5300
Page 10 of 10
39. A manufacturer of electronic chip is interested in
estimating the fraction defective
chips produced in one of their plants. A random sample
of 200 chips produced 12
defectives. The point estimate and a 95% confidence interval on
the fraction defective
would be
and 95% confidence interval
and 95% confidence interval
and 95% confidence interval
(d) 0.06p and 95% confidence interval
(e) None of the above.
40.
The poll conducted by media and other agencies use a 95% conf
idence unless specified
otherwise. A 95% confidence interval for p
at a 95% confidence is given by
21. (1 )
1.96
p p
p
n
Where n is the sample size.
is the proportion of those in the sample
who approve of the way the President is handling the economy.
If the margin of error is
±3 percent, the sample size used in the study was
(a) 735
(b) 840
(c) 984
(d) 649
(e) 526
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