Ms. Gene Dempsey manages the emergency care center at Bell Grove Medical Center. One of
her responsibilities is to have enough nurses so that incoming patients needing service can be
handled promptly. It is stressful for patients to wait a long time for e
Arbitron Media Research Inc. conducted a study of the iPod listening habits of men and women.
One facet of the study involved the mean listening time. It was discovered that the mean
listening time for men was 35 minutes per day. The standard deviation of
Refer to the description of Century National Bank at the end of the Review of Chapters 14 on
page 128.
With many other options available, customers no longer let their money sit in a checking
account. For many years the mean checking balance has been $1,6
A stock analyst wants to determine whether there is a difference in the mean rate of return for
three types of stock: utility, retail, and banking stocks. The following output is obtained:
.:.
a. Using the .05 level of significance, is there a difference
There are three hospitals in the Tulsa, Oklahoma, area. The following data show the number of
outpatient surgeries performed on Monday, Tuesday, Wednesday, Thursday, and Friday at each
hospital last week. At the .05 significance level, can we conclude the
The following are six observations collected from treatment 1, four observations collected from
treatment 2, and five observations collected from treatment 3. Test the hypothesis at the .05
significance level that the treatment means are equal.
.:.
a. Sta
Refer to the Baseball 2012 data, which report information on the 30 Major League Baseball
teams for the 2012 season.
a. At the .10 significance level, is there a difference in the variation in team salary among the
American and National League teams?
b. C
A software design company is creating a new, faster search engine. The search engine is clearly
faster, but initial tests indicate there is more variation in the time to perform a search. A sample
of 16 different searches showed that the standard deviatio
The following are three observations collected from treatment 1, five observations collected from
treatment 2, and four observations collected from treatment 3. Test the hypothesis that the
treatment means are equal at the .05 significance level.
.:.
a. S
The city of Tucson, Arizona, employs people to assess the value of homes for the purpose of
establishing real estate tax. The city manager sends each assessor to the same five homes and
then compares the results. The information is given below, in thousan
Refer to the Real Estate data, which report information on the homes sold in the Goodyear,
Arizona, area last year.
a. At the .02 significance level, is there a difference in the variability of the selling prices of the
homes that have a pool versus those
Random samples of five were selected from each of three populations. The sum of squares total
was 100. The sum of squares due to the treatments was 40.
a. Set up the null hypothesis and the alternate hypothesis.
b. What is the decision rule? Use the .05 s
The following data are given for a two-factor ANOVA with two treatments and three blocks.
.:.
SOLUTION:
a.
Ho: 1 = 2
H1: Not all treatment means are equal
b.
Reject Ho if F > 18.5
c.
Ho: A = B = C
H1: Not all block means are equal
Reject Ho if F > 19.0
d.
Chapin Manufacturing Company operates 24 hours a day, 5 days a week. The workers rotate
shifts each week. Management is interested in whether there is a difference in the number of
units produced when the employees work on various shifts. A sample of five
Robert Altoff is vice president for engineering for a manufacturer of household washing
machines. As part of new product development, he wishes to determine the optimal length of
time for the washing cycle. A part of the development is to study the relati
The following data are given for a two-factor ANOVA with three treatments and three blocks.
.:.
SOLUTION:
a.
Ho: 1 = 2 = 3
b.
Reject Ho if F > 6.94
c.
H1: Not all treatment means are equal
Ho: A = B = C
H1: Not all block means are equal
Reject Ho if F > 6
The following are four observations collected from each of three treatments. Test the hypothesis
that the treatment means are equal. Use the .05 significance level.
.:.
a. State the null and the alternate hypotheses.
b. What is the decision rule?
c. Compu
The following are six observations collected from treatment 1, ten observations collected from
treatment 2, and eight observations collected from treatment 3. Test the hypothesis that the
treatment means are equal at the .05 significance level.
.:.
a. Sta
Jacob Lee is a frequent traveler between Los Angeles and San Francisco. For the past month, he
wrote down the flight times on three different airlines. The results are:
.:.
a. Use the .05 significance level and the six-step hypothesis-testing process to c
The manager of a computer software company wishes to study the number of hours senior
executives by type of industry spend at their desktop computers. The manager selected a sample
of five executives from each of three industries. At the .05 significance
For your e-mail, you use a filter to block spam from your inbox. The number of items blocked by
day of week is recorded and Minitab is used to perform the analysis that follows. Here are the
results:
.:.
Using the ANOVA results, compare the average number
Williams Corporation is investigating the effects of educational background on employee
performance. A potential relevant variable in this case is the self-rated social status of the
employee. The company has recorded the annual sales volumes (in $000) ac
A test is to be conducted involving the mean holding power of two glues designed for plastic.
First, a small plastic hook was coated at one end with Epox glue and fastened to a sheet of
plastic. After it dried, weight was added to the hook until it separa
A Buffalo, New York, cola distributor is featuring a super-special sale on 12-packs. She wonders
where in the grocery store to place the cola for maximum attention. Should it be near the front
door of the grocery stores, in the cola section, at the checko
A school supervisor is reviewing initial wages of former students (in $000). Samples were taken
over 3 years for four different majors (accounting, administration, finance, and marketing). For
each combination of major and year, three former students were