As an investigation into the effect of smoking on physical activity, the followi
ID: 3231306 • Letter: A
Question
As an investigation into the effect of smoking on physical activity, the following experiment was conducted. The pool of available subjects was divided into non-smokers, moderate smokers, and heavy smokers; nine people in each group were randomly chosen. In each group the subjects were randomly assigned to one of the following stress tests: bicycle ergometer, treadmill, or step test. After completion of the stress tests, time until maximum oxygen uptake was recorded for each subject. Results were analyzed using SAS, with output given on Page 2. At a significance level of alpha = 0.05, does the output indicate the presence of interaction between smoking history and type of stress test? What number(s) did you use to make your decision, and how? Is this result consistent with what you see in the graph below? Explain. At a significance level of alpha = 0.05, does the output indicate that there is a difference in time to maximum oxygen uptake for people with different smoking histories? What number(s) did you use to make your decision, and how? Summarize your observations based on the Tukey multiple comparison procedure. Explain why you chose that procedure.Explanation / Answer
A ) as we see that none of the lines in the interaction plot intersect each other , we can say that there is no interaction between the 2 variables. Please note that , if there is a significant interaction between the 2 variables , the corresponding lines would intersect which inturn shows that the results are infact statistically significant .
Now , since the given lines are alomost parallel to one another , at an alpha = 0.05 we are sure that there is no interaction between the variables smoking history and type of stress test
page2 is not provided to answer the B and C part of the question
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