This document provides information and questions for the Devry Math 533 final exam, including: 1) A sample hypothesis test question about the number of weeks it takes a company to place clients in jobs. 2) A binomial distribution question about the number of republicans that might vote in a congressional district. 3) A question involving descriptive statistics such as range, median, and standard deviation for sales data.

1. DEVRY MATH 533 Final Exam
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MATH 533 Final Exam 4 Sets
Set 1
(TCO D) PuttingPeople2Work has a growing business placing out-of-work
MBAs. They claim they can place a client in a job in their field in less than 36
weeks. You are given the following data from a sample.
Sample size: 100
Population standard deviation: 5
Sample mean: 34.2
Formulate a hypothesis test to evaluate the claim. (Points : 10)

2. Ans. b.
H0 must always have equal sign, < 36 weeks
2. (TCO B) The Republican party is interested in studying the number of
republicans that might vote in a particular congressional district. Assume
that the number of voters is binomially distributed by party affiliation (either
republican or not republican). If 10 people show up at the polls, determine
the following:
Binomial distribution
3. (TCO A) Company ABC had sales per month as listed below. Using the
Minitab output given, determine:
(A) Range (5 points);
(B) Median (5 points); and
(C) The range of the data that would contain 68% of the results. (5 points).
Raw data: sales/month (Millions of $)
(TCO A) Company ABC had sales per month as listed below. Using the
MegaStat output given, determine:
(A) Range (5 points)
(B) Median (5 points)
(C) The range of the data that would contain 68% of the results. (5 points)
4. (TCO C, D) Tesla Motors needs to buy axles for their new car. They are
considering using Chris Cross Manufacturing as a vendor. Tesla's requirement
is that 95% of the axles are 100 cm ± 2 cm. The following data is from a test
run from Chris Cross Manufacturing. Should Tesla select them as a vendor?
Explain your answer.
Descriptive statistics
Tesla Motors needs to buy axles for their new car. They are considering using
Chris Cross Manufacturing as a vendor. Tesla’s requirement is that 95% of the
axles are 100 cm ± 5 cm. The following data is MegaStat output from a test
run from Chris Cross Manufacturing.
Descriptive statistics
Question: Should Tesla select them as a vendor? Explain your answer.
Answers (1)
• Given that,
Tesla Motors needs to buy axles for their new car.
They are considering using Chris Cross Manufacturing as a vendor.
Tesla’s requirement is that 95% of the axles are 100 cm ± 5 cm.
The following data is MegaStat output from a test run from Chris

3. Cross Manufacturing:
5. (TCO D) A PC manufacturer claims that no more than 2% of their machines
are defective. In a random sample of 100 machines, it is found that 4.5% are
defective. The manufacturer claims this is a fluke of the sample. At a .02
level of significance, test the manufacturer's claim, and explain your answer.
Final Page 2
1. (TCO B) The following table gives the number of visits to recreational
facilities by kind and geographical region.
(Points : 30)
2. (TCO B, F) The length of time Americans exercise each week is normally
distributed with a mean of 15.8 minutes and a standard deviation of 2.2
minutes
X P(X≤x) P(X≥x) Mean Std dev
11 .0146 .9854 15.8 2.2
15 .3581 .6419 15.8 2.2
21 .9910 .0090 15.8 2.2
24 .9999 .0001 15.8 2.2
p(lower) p(upper)
Set 2
1. (TCO A) Seventeen salespeople reported the following number of sales
calls completed last month.
72 93 82 81 82 97 102 107 119
86 88 91 83 93 73 100 102
a. Compute the mean, median, mode, and standard deviation, Q1, Q3, Min,
and Max for the above sample data on number of sales calls per month.
b. In the context of this situation, interpret the Median, Q1, and Q3. (Points :
33)
a.
b. Median of the above sales calls means that if all the sales calls data
points are arranged in an ascending order, then 91 Nos. of calls made would
fall in the middle. So, there are as 8 sales calls
2. (TCO B) Cedar Home Furnishings has collected data on their customers in
terms of whether they reside in an urban location or a suburban location, as

4. well as rating the customers as either “good,” “borderline,” or “poor.” The
data is below.
Urban Suburban Total
Good 60 168 228
Borderline 36 72 108
Poor 24 40 64
Total 120 280 400
If you choose a customer at random, then find the probability that the
customer
a. is considered “borderline.”
b. is considered “good” and resides in an urban location.
c. is suburban, given that customer is considered “poor.” (Points : 18)
3. (TCO B) Historically, 70% of your customers at Rodale Emporium pay for
their purchases using credit cards. In a sample of 20 customers, find the
probability that
a. exactly 14 customers will pay for their purchases using credit cards.
b. at least 10 customers will pay for their purchases using credit cards.
4. (TCO B) The demand for gasoline at a local service station is normally
distributed with a mean of 27,009 gallons per day and a standard deviation
of 4,530 gallons per day.
a. Find the probability that the demand for gasoline exceeds 22,000 gallons
for a given day.
c. How many gallons of gasoline should be on hand at the beginning of each
day so that we can meet the demand 90% of the time (i.e., the station
stands a 10% chance of running out of gasoline for that day)? (Points : 18)
5. (TCO C) An operations analyst from an airline company has been asked to
develop a fairly accurate estimate of the mean refueling and baggage
handling time at a foreign airport. A random sample of 36 refueling and
baggage handling times yields the following results.

5. Sample Size = 36
Sample Mean = 24.2 minutes
Sample Standard Deviation = 4.2 minutes
a. Compute the 90% confidence interval for the population mean refueling
and baggage time.
b. Interpret this interval.
c. How many refueling and baggage handling times should be sampled so
that we may construct a 90% confidence interval with a sampling error of .5
minutes for the population mean refueling and baggage time? (Points : 18)
6. (TCO C) The manufacturer of a certain brand of toothpaste claims that a
high percentage of dentists recommend the use of their toothpaste. A
random sample of 400 dentists results in 310 recommending their
toothpaste.
a. Compute the 99% confidence interval for the population proportion of
dentists who recommend the use of this toothpaste.
b. Interpret this confidence interval.
c. How large a sample size will need to be selected if we wish to have a 99%
confidence interval that is accurate to within 3%? (Points : 18)
7. (TCO D) A Ford Motor Company quality improvement team believes that its
recently implemented defect reduction program has reduced the proportion
of paint defects. Prior to the implementation of the program, the proportion
of paint defects was .03 and had been stationary for the past 6 months. Ford
selects a random sample of 2,000 cars built after the implementation of the
defect reduction program. There were 45 cars with paint defects in that
sample. Does the sample data provide evidence to conclude that the
proportion of paint defects is now less than .03 (with a = .01)? Use the
hypothesis testing procedure outlined below.
a. Formulate the null and alternative hypotheses.
b. State the level of significance.
c. Find the critical value (or values), and clearly show the rejection and
nonrejection regions.
d. Compute the test statistic.
e. Decide whether you can reject Ho and accept Ha or not.

6. f. Explain and interpret your conclusion in part e. What does this mean?
g. Determine the observed p-value for the hypothesis test and interpret this
value. What does this mean?
h. Does the sample data provide evidence to conclude that the proportion of
paint defects is now less than .03 (with a = .01)? (Points : 24)
8. (TCO D) A new car dealer calculates that the dealership must average
more than 4.5% profit on sales of new cars. A random sample of 81 cars
gives the following result.
Sample Size = 81
Sample Mean = 4.97%
Sample Standard Deviation = 1.8%
Does the sample data provide evidence to conclude that the dealership
averages more than 4.5% profit on sales of new cars (using a = .10)? Use the
hypothesis testing procedure outlined below.
a. Formulate the null and alternative hypotheses.
b. State the level of significance.
c. Find the critical value (or values), and clearly show the rejection and
nonrejection regions.
d. Compute the test statistic.
e. Decide whether you can reject Ho and accept Ha or not.
f. Explain and interpret your conclusion in part e. What does this mean?
g. Determine the observed p-value for the hypothesis test and interpret this
value. What does this mean?
h. Does the sample data provide evidence to conclude that the dealership
averages more than 4.5% profit on sales of new cars (using a = .10)?
(Points : 24)

7. 1. (TCO E) Bill McFarland is a real estate broker who specializes in selling
farmland in a large western state. Because Bill advises many of his clients
about pricing their land, he is interested in developing a pricing formula of
some type. He feels he could increase his business significantly if he could
accurately determine the value of a farmer’s land. A geologist tells Bill that
the soil and rock characteristics in most of the area that Bill sells do not vary
much. Thus the price of land should depend greatly on acreage. Bill selects a
sample of 30 plots recently sold. The data is found below (in Minitab), where
X=Acreage and Y=Price ($1,000s).
a. Analyze the above output to determine the regression equation.
b. Find and interpret in the context of this problem.
c. Find and interpret the coefficient of determination (r-squared).
d. Find and interpret coefficient of correlation.
e. = .05) that the acreageDoes the data provide significant evidence ( can
be used to predict the price? Test the utility of this model using a two-tailed
test. Find the observed p-value and interpret.
f. Find the 95% confidence interval for mean price of plots of farmland that
are 50 acres. Interpret this interval.
g. Find the 95% prediction interval for the price of a single plot of farmland
that is 50 acres. Interpret this interval.
h. What can we say about the price for a plot of farmland that is 250 acres?
(Points : 48)
4
1. (TCO E) An insurance firm wishes to study the relationship between driving
experience (X1, in years), number of driving violations in the past three
years (X2), and current monthly auto insurance premium (Y). A sample of 12
insured drivers is selected at random. The data is given below (in MINITAB):
a. Analyze the above output to determine the multiple regression equation.

8. b. Find and interpret the multiple index of determination (R-Sq).
= .05). Interpret your results.c. Perform the t-tests on and on (use two
tailed test with (
d. Predict the monthly premium for an individual having 8 years of driving
experience and 1 driving violation during the past 3 years. Use both a point
estimate and the appropriate interval estimate.
(Points : 31)