Statistics for Business and Economics (13th Edition)
13th Edition
ISBN: 9780134506593
Author: James T. McClave, P. George Benson, Terry Sincich
Publisher: PEARSON
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Textbook Question
Chapter 9.5, Problem 9.68LM
The next table gives data for a 2 × 2 factorial experiment with two observations per factor-level combination.
Identify the treatments for this experiment. Calculate and plot the treatment means, using the response variable as the y-axis and the levels of factor B as the x-axis. Use the levels of factor A as plotting symbols. Do the treatment means appear to differ? Do the factors appear to interact?
Use the computational formulas in Appendix C to create an ANOVA table for this experiment.
Test to determine whether the treatment means differ at the α = .05 level of significance. Does the test support your visual interpretation from part a?
Does the result of the test in part b warrant a test for interaction between the two factors? If so. perform it using α = .05.
Do the results of the previous tests warrant tests of the two factor main effects? If so, perform them using α = .05. Yes.
Interpret the results of the tests. Do they support your visual interpretation from part a?
Given the results of your tests, which pairs of means, if any, should be compared?
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A test was conducted of two overnight mail delivery services. Two samples of identical deliveries were set up so that both delivery services were notified of the need for a
delivery at the same time. The hours required to make each delivery follow. Do the data shown suggest a difference in the delivery times for the two services? Use a .05 level
of significance for the test. Use Table 1 of Appendix B.
Click on the datafile logo to reference the data.
DATA file
Service
Delivery
1
2
24.5
26.0
28.0
21.0
18.0
36.0
25.0
21.0
24.0
26.0
31.0
28.0
25.5
32.0
20.0
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29.0
22.0
23.5
29.5
30.0
What is the z-statistic? If required, round your answer to two decimal places. Enter negative values as negative number, if necessary.
-.31
What is the p-value? If required, round your answer to two decimal places.
.76
Conclude.
12345 7890:=
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Chapter 9 Solutions
Statistics for Business and Economics (13th Edition)
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