Ledolter and Hogg (see References) report that volunteers who had a smoking history

Chapter 9, Problem 9.4-9

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Ledolter and Hogg (see References) report that volunteers who had a smoking history classified as heavy, moderate, and nonsmoker were accepted until nine men were in each category. Three men in each category were randomly assigned to each of the following three stress tests: bicycle ergometer, treadmill, and step tests. The time until maximum oxygen uptake was recorded in minutes as follows: Test Smoking History Bicycle Treadmill Step Test Nonsmoker 12.8, 13.5, 11.2 16.2, 18.1, 17.8 22.6, 19.3, 18.9 Moderate 10.9, 11.1, 9.8 15.5, 13.8, 16.2 20.1, 21.0, 15.9 Heavy 8.7, 9.2, 7.5 14.7, 13.2, 8.1 16.2, 16.1, 17.8 (a) Analyze the results of this experiment. Obtain the ANOVA table and test for main effects and interactions. (b) Use box plots to compare the data graphically.

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