A medical researcher designed an experiment to study the impact of three exercise regimens (30, 60, and 90 minutes per week) on the total blood cholesterol level in active adult males.

Refer to Exercise 15.37.

a. Does a residual analysis support the conditions necessary to conduct your tests in Exercise 15.37?

b. Conduct an analysis of the data, assuming that the normality condition does not hold, using a rank-based procedure.

c. Compare your conclusions about exercise regimens and age groups reached using the rank-based procedure to your conclusions reached using the normal-based procedures. Which set of conclusions would be more easily supported using the given data?

Exercise 15.37

A medical researcher designed an experiment to study the impact of three exercise regimens (30, 60, and 90 minutes per week) on the total blood cholesterol level in active adult males.  The researcher was concerned that the effect of the type of exercise program on cholesterol might also depend on the age of the individual. Nine participants in each of three age groups (A1: 20–29, A2: 30–39, A3: 40–49) were obtained from five fitness centers. The total blood cholesterol level of the participants were measured both prior to the start of the study and after 6 months on the exercise regimens. The reductions in total blood cholesterol level are given in the following table.

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a. Identify the design by name.

b. Write a model for this study, identifying all the terms in the model.

c. Do the data support the research hypothesis that the mean reduction in cholesterol increases with an increase in exercise? Use a Best Custom Essay Writing Services | EssayBureau.com .05 in reaching your conclusion.

d. Is your answer in part (c) consistent across all three age groups? Support your answer with a p-value from an appropriate test of hypotheses.

e. Assume that the effectiveness of the three exercise regimens differed for the three age groups. Group the three exercise regimens separately for each age group using an overall Type I error rate of .05.

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