Question 1 of 40 2.5 Points A die with 12 sides is rolled. What is the probability of rolling a number less than 11? Is this the same as rolling a total less than 11 with two six-sided dice? Explain. A. 2/6 B. 3/6 C. 4/6 D. 5/6 Question 2 of 40 2.5 Points Based on meteorological records, the probability that it will snow in a certain town on January 1st is 0.413. Find the probability that in a given year it will not snow on January 1st in that town. A. 0.345 B. 0.425 C. 0.587 D. 0.592 Question 3 of 40 2.5 Points A study of 600 college students taking Statistics 101 revealed that 54 students received the grade of A. Typically 10% of the class gets an A. The difference between this group of students and the expected value is not significant at the 0.05 level. What does this mean in this case? A. The probability that the difference occurred due to chance is less than 0.05. B. The probability of getting an A is 10% and only 9% got an A in this study. The difference is less than 5% so it is not significant. C. There is not enough information to make any conclusion. D. The probability that the difference occurred due to chance is more than 0.05. Question 4 of 40 2.5 Points A committee of three people is to be formed. The three people will be selected from a list of five possible committee members. A simple random sample of three people is taken, without replacement, from the group of five people. Using the letters A, B, C, D, E to represent the five people, list the possible samples of size three and use your list to determine the probability that B is included in the sample. (Hint: There are 10 possible samples.) A. 0.6 B. 0.4 C. 0.7 D. 0.8 Question 5 of 40 2.5 Points If you flip a coin three times, the possible outcomes are HHH, HHT, HTH, HTT, THH, THT, TTH, TTT. What is the probability of getting at least one head? A. 4/9 B. 5/6 C. 7/8 D. 5/8 Question 6 of 40 2.5 Points In the first series of rolls of a die, the number of odd numbers exceeded the number of even numbers by 5. In the second series of rolls of the same die, the number of odd numbers exceeded the number of even numbers by 11. Determine which series is closer to the 50/50 ratio of odd/even expected of a fairly rolled die. A. The second series is closer because the difference between odd and even numbers is greater than the difference for the first series. B. The first series is closer because the difference between odd and even numbers is less than the difference for the second series. C. Since 1/2 > 1/5 > 1/11, the first series is closer. D. The series closer to the theoretical 50/50 cannot be determined unless the total number of rolls for both series is given. Reset Selection Question 7 of 40 2.5 Points A study of students taking Statistics 101 was done. Four hundred students who studied for more than 10 hours averaged a B. Two hundred students who studied for less than 10 hours averaged a C. This difference was significant at the 0.01 level. What does this mea.

1. Question 1 of 40
2.5 Points
A die with 12 sides is rolled. What is the probability of rolling a
number less than 11? Is this the same as rolling a total less than
11 with two six-sided dice? Explain.
A. 2/6
B. 3/6
C. 4/6
D. 5/6
Question 2 of 40
2.5 Points
Based on meteorological records, the probability that it will
snow in a certain town on January 1st is 0.413. Find the
probability that in a given year it will not snow on January 1st
in that town.
A. 0.345
B. 0.425
C. 0.587
D. 0.592
Question 3 of 40
2.5 Points
A study of 600 college students taking Statistics 101 revealed
that 54 students received the grade of A. Typically 10% of the
class gets an A. The difference between this group of students
and the expected value is not significant at the 0.05 level. What
does this mean in this case?
A. The probability that the difference occurred due to chance is
less than 0.05.

2. B. The probability of getting an A is 10% and only 9% got an A
in this study. The difference is less than 5% so it is not
significant.
C. There is not enough information to make any conclusion.
D. The probability that the difference occurred due to chance is
more than 0.05.
Question 4 of 40
2.5 Points
A committee of three people is to be formed. The three people
will be selected from a list of five possible committee members.
A simple random sample of three people is taken, without
replacement, from the group of five people. Using the letters A,
B, C, D, E to represent the five people, list the possible samples
of size three and use your list to determine the probability that
B is included in the sample. (Hint: There are 10 possible
samples.)
A. 0.6
B. 0.4
C. 0.7
D. 0.8
Question 5 of 40
2.5 Points
If you flip a coin three times, the possible outcomes are HHH,
HHT, HTH,
HTT, THH, THT, TTH, TTT. What is the probability of getting
at least one head?
A. 4/9
B. 5/6
C. 7/8

3. D. 5/8
Question 6 of 40
2.5 Points
In the first series of rolls of a die, the number of odd numbers
exceeded the number of even numbers by 5. In the second series
of rolls of the same die, the number of odd numbers exceeded
the number of even numbers by 11. Determine which series is
closer to the 50/50 ratio of odd/even expected of a fairly rolled
die.
A. The second series is closer because the difference between
odd and even numbers is greater than the difference for the first
series.
B. The first series is closer because the difference between odd
and even numbers is less than the difference for the second
series.
C. Since 1/2 > 1/5 > 1/11, the first series is closer.
D. The series closer to the theoretical 50/50 cannot be
determined unless the total number of rolls for both series is
given.
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Question 7 of 40
2.5 Points
A study of students taking Statistics 101 was done. Four
hundred students who studied for more than 10 hours averaged a
B. Two hundred students who studied for less than 10 hours
averaged a C. This difference was significant at the 0.01 level.
What does this mean?
A. The probability that the difference was due to chance alone
is greater than 0.01.
B. There is less than a 0.01 chance that the first group’s grades

4. were better by chance alone.
C. The improvement was due to the fact that more people
studied.
D. There is not enough information to make any conclusion.
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Question 8 of 40
2.5 Points
A bag contains four chips of which one is red, one is blue, one
is green, and one is yellow. A chip is selected at random from
the bag and then replaced in the bag. A second chip is then
selected at random. Make a list of the possible outcomes (for
example, RB represents the outcome red chip followed by blue
chip) and use your list to determine the probability that the two
chips selected are the same color. (Hint: There are 16 possible
outcomes.)
A. 1/4
B. 3/4
C. 2/16
D. 3/16
Question 9 of 40
2.5 Points
On a multiple choice test, each question has 6 possible answers.
If you make a random guess on the first question, what is the
probability that you are correct?
A. 1/5
B. 1/6
C. 1/4

5. D. 2/5
Question 10 of 40
2.5 Points
Joe dealt 20 cards from a standard 52-card deck, and the number
of red cards exceeded the number of black cards by 8. He
reshuffled the cards and dealt 30 cards. This time, the number
of red cards exceeded the number of black cards by 10.
Determine which deal is closer to the 50/50 ratio of red/black
expected of fairly dealt hands from a fair deck and why.
A. The first series is closer because 1/10 is farther from 1/2
than is 1/8.
B. The series closer to the theoretical 50/50 cannot be
determined unless the number of red and black cards for each
deal is given.
C. The second series is closer because 20/30 is closer to 1/2
than is 14/20.
D. The first series is closer because the difference between red
and black is smaller than the difference in the second series.
Question 11 of 40
2.5 Points
If you flip a coin three times, the possible outcomes are HHH,
HHT, HTH, HTT, THH, THT, TTH, TTT. What is the
probability that at least two heads occur consecutively?
A. 1/8
B. 3/8
C. 5/8
D. 6/8
Question 12 of 40
2.5 Points
The data set represents the income levels of the members of a

6. country club. Estimate the probability that a randomly selected
member earns at least $98,000.
112,000 126,000 90,000 133,000 94,000 112,000 98,000 82,000
147,000 182,000 86,000 105,000
140,000 94,000 126,000 119,000 98,000 154,000 78,000
119,000
A. 0.4
B. 0.6
C. 0.66
D. 0.7
Question 13 of 40
2.5 Points
Suppose you have an extremely unfair die: The probability of a
6 is 3/8, and the probability of each other number is 1/8. If you
toss the die 32 times, how many twos do you expect to see?
A. 2
B. 4
C. 3
D. 5
Question 14 of 40
2.5 Points
The distribution of B.A. degrees conferred by a local college is
listed below, by major.
Major
Frequency
English 2073
Mathematics 2164
Chemistry 318

7. Physics 856
Liberal Arts 1358
Business 1676
Engineering
868
9313
What is the probability that a randomly selected degree is not in
Business?
A. 0.7800
B. 0.8200
C. 0.8300
D. 0.9200
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What's This?
Question 15 of 40
2.5 Points
A study of two types of weed killers was done on two identical
weed plots. One weed killer killed 15% more weeds than the
other. This difference was significant at the 0.05 level. What
does this mean?
A. The improvement was due to the fact that there were more
weeds in one study.
B. The probability that the difference was due to chance alone
is greater than 0.05.
C. The probability that one weed killer performed better by
chance alone is less than 0.05.
D. There is not enough information to make any conclusion.

8. Question 16 of 40
2.5 Points
Suppose you have an extremely unfair coin: the probability of a
head is 1/3 and the probability of a tail is 2/3. If you toss the
coin 72 times, how many heads do you expect to see?
A. 12
B. 22
C. 24
D. 26
Question 17 of 40
2.5 Points
If you flip a coin three times, the possible outcomes are HHH,
HHT, HTH, HTT, THH, THT, TTH, TTT. What is the
probability of getting at least two tails?
A. 1/2
B. 2/3
C. 3/4
D. 4/9
Question 18 of 40
2.5 Points
A sample space consists of 46 separate events that are equally
likely. What is the probability of each?
A. 1/24
B. 1/46
C. 1/32
D. 1/18
Question 19 of 40

9. 2.5 Points
In a poll, respondents were asked whether they had ever been in
a car accident. 220 respondents indicated that they had been in a
car accident and 370 respondents said that they had not been in
a car accident. If one of these respondents is randomly selected,
what is the probability of getting someone who has been in a car
accident? Round to the nearest thousandth.
A. 0.384
B. 0.380
C. 0.373
D. 0.370
Question 20 of 40
2.5 Points
Jody checked the temperature 12 times on Monday, and the last
digit of the temperature was odd six times more than it was
even. On Tuesday, she checked it 18 times and the last digit was
odd eight times more than it was even. Determine which series
is closer to the 50/50 ratio of odd/even expected of such a series
of temperature checks.
A. The Monday series is closer because 1/6 is closer to 1/2 than
is 1/8.
B. The Monday series is closer because 6/12 is closer to 0.5
than is 8/18.
C. The Tuesday series is closer because the 13/18 is closer to
0.5 than is 9/12.
D. The series closest to the theoretical 50/50 cannot be
determined without knowing the number of odds and evens in
each series.
Question 21 of 40
2.5 Points

10. Eleven female college students are selected at random and asked
their heights. The heights (in inches) are as follows:
67, 59, 64, 69, 65, 65, 66, 64, 62, 64, 62
Estimate the mean height of all female students at this college.
Round your answer to the nearest tenth of an inch if necessary.
A. It is not possible to estimate the population mean from this
sample data
B. 64.3 inches
C. 64.9 inches
D. 63.7 inches
Question 22 of 40
2.5 Points
Suggest the cause of the correlation among the data.
The graph shows strength of coffee (y) and number of scoops
used to make 10 cups of coffee (x). Identify the probable cause
of the correlation.
A.
The variation in the x variable is a direct cause of the variation
in
the y variable.
B. There is no correlation between the variables.
C. The correlation is due to a common underlying cause.
D. The correlation between the variables is coincidental.
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What's This?
Question 23 of 40
2.5 Points
The scatter plot and best-fit line show the relation among the

11. number of cars waiting by a school (y) and the amount of time
after the end of classes (x) in arbitrary units. The correlation
coefficient is -0.55. Determine the amount of variation in the
number of cars not explained by the variation time after school.
A. 55%
B. 70%
C. 30%
D. 45%
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What's This?
Question 24 of 40
2.5 Points
Select the best estimate of the correlation coefficient for the
data depicted in the scatter diagram.
A. -0.9
B. 0.9
C. 0.5
D. -0.5
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Question 25 of 40
2.5 Points
A population proportion is to be estimated. Estimate the
minimum sample size needed to achieve a margin of error E =
0.01with a 95% degree of confidence.
A. 7,000
B. 8,000

12. C. 9,000
D. 10,000
Question 26 of 40
2.5 Points
Which point below would be an outlier if it were on the
following graph?
A. (25, 20)
B. (5, 12)
C. (7, 5)
D. (5, 3)
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Question 27 of 40
2.5 Points
A researcher wishes to estimate the proportion of college
students who cheat on exams. A poll of 560 college students
showed that 27% of them had, or intended to, cheat on
examinations. Find the 95% confidence interval.
A. 0.2323 to 0.3075
B. 0.2325 to 0.3075
C. 0.2325 to 0.3185
D. 0.2323 to 0.3185
Question 28 of 40
2.5 Points
Monthly incomes of employees at a particular company have a
mean of $5954. The distribution of sample means for samples of
size 70 is normal with a mean of $5954 and a standard deviation
of $259. Suppose you take a sample of size 70 employees from

13. the company and find that their mean monthly income is $5747.
How many standard deviations is the sample mean from the
mean of the sampling distribution?
A. 0.8 standard deviations above the mean
B. 0.8 standard deviations below the mean
C. 7.3 standard deviations below the mean
D. 207 standard deviations below the mean
Question 29 of 40
2.5 Points
The graph shows a measure of fitness (y) and miles walked
weekly. Identify the probable cause of the correlation.
A. The correlation is coincidental.
B. There is a common underlying cause of the correlation.
C. There is no correlation between the variables.
D. Walking is a direct cause of the fitness.
Question 30 of 40
2.5 Points
A random sample of 30 households was selected from a
particular neighborhood. The number of cars for each household
is shown below. Estimate the mean number of cars per
household for the population of households in this
neighborhood. Give the 95% confidence interval.
A. 1.14 to 1.88
B. 1.12 to 1.88
C. 1.12 to 1.98
D. 1.14 to 1.98
Question 31 of 40

14. 2.5 Points
The scatter plot and best-fit line show the relation among the
data for the price of a stock (y) and employment (x) in arbitrary
units. The correlation coefficient is 0.8. Predict the stock price
for an employment value of 6.
A. 8.8
B. 6.2
C. 8.2
D. None of the values are correct
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What's This?
Question 32 of 40
2.5 Points
Among a random sample of 150 employees of a particular
company, the mean commute distance is 29.6 miles. This mean
lies 1.2 standard deviations above the mean of the sampling
distribution. If a second sample of 150 employees is selected,
what is the probability that for the second sample, the mean
commute distance will be less than 29.6 miles?
A. 0.8849
B. 0.5
C. 0.1131
D. 0.1151
Question 33 of 40
2.5 Points
A sample of nine students is selected from among the students
taking a particular exam. The nine students were asked how
much time they had spent studying for the exam and the
responses (in hours) were as follows:

15. 18, 7, 10, 13, 12, 16, 5, 20, 21
Estimate the mean study time of all students taking the exam.
Round your answer to the nearest tenth of an hour if necessary.
A. 13 hours
B. 12.2 hours
C. 13.6 hours
D. It is not possible to estimate the population mean from this
sample data
Question 34 of 40
2.5 Points
Among a random sample of 500 college students, the mean
number of hours worked per week at non-college related jobs is
14.6. This mean lies 0.4 standard deviations below the mean of
the sampling distribution. If a second sample of 500 students is
selected, what is the probability that for the second sample, the
mean number of hours worked will be less than 14.6?
A. 0.5
B. 0.6179
C. 0.6554
D. 0.3446
Question 35 of 40
2.5 Points
30% of the fifth grade students in a large school district read
below grade level. The distribution of sample proportions of
samples of 100 students from this population is normal with a
mean of 0.30 and a standard deviation of 0.045. Suppose that
you select a sample of 100 fifth grade students from this district
and find that the proportion that reads below grade level in the
sample is 0.36. What is the probability that a second sample
would be selected with a proportion less than 0.36?

16. A. 0.8932
B. 0.8920
C. 0.9032
D. 0.9048
Question 36 of 40
2.5 Points
A researcher wishes to estimate the proportion of college
students who cheat on exams. A poll of 490 college students
showed that 33% of them had, or intended to, cheat on
examinations. Find the margin of error for the 95% confidence
interval.
A. 0.0432
B. 0.0434
C. 0.0425
D. 0.0427
Question 37 of 40
2.5 Points
Of the 6796 students in one school district, 1537 cannot read up
to grade level. Among a sample of 812 of the students from this
school district, 211 cannot read up to grade level. Find the
sample proportion of students who cannot read up to grade
level.
A. 0.14
B. 0.26
C. 211
D. 0.23
Question 38 of 40

17. 2.5 Points
In a poll of 400 voters in a certain state, 61% said that they
opposed a voter ID bill that might hinder some legitimate voters
from voting. The margin of error in the poll was reported as 4
percentage points (with a 95% degree of confidence). Which
statement is correct?
A. The reported margin of error is consistent with the sample
size.
B. There is not enough information to determine whether the
margin of error is consistent with the sample size.
C. The sample size is too small to achieve the stated margin of
error.
D. For the given sample size, the margin of error should be
smaller than stated.
Question 39 of 40
2.5 Points
A researcher wishes to estimate the mean amount of money
spent per month on food by households in a certain
neighborhood. She desires a margin of error of $30. Past studies
suggest that a population standard deviation of $248 is
reasonable. Estimate the minimum sample size needed to
estimate the population mean with the stated accuracy.
A. 274
B. 284
C. 264
D. 272
Question 40 of 40
2.5 Points
Write possible coordinates for the single outlier such that it
would no longer be an outlier.

18. A. (23, 18)
B. (20, 5)
C. (15, 15)
D. (12, 15)
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