A Researcher Wished to Compare the Effect of the Different

question 28

Multiple Choice

A researcher wished to compare the effect of the different rates of stepping on volunteers' heart rates in a step-aerobics workout.A collection of thirty adult volunteers,fifteen women and fifteen men,were selected from a local gym.The men were randomly divided into three groups of five subjects each.Each group did a standard step-aerobics workout,with Group 1 at a low rate of stepping,Group 2 at a medium rate of stepping,and Group 3 at a rapid rate.The women were also randomly divided into three groups of five subjects each.As with the men,each group did a standard step-aerobics workout,with Group 1 at a low rate of stepping,Group 2 at a medium rate of stepping,and Group 3 at a rapid rate.The mean heart rate at the end of the workout for all the subjects was determined in beats per minute. A partial ANOVA table for these data is given below. The profile plot and the P-value for the test for interaction show little evidence of interaction.What can we conclude?

• A)There is little difference in the heart rates of men and women.
• B)The change in heart rate due to different stepping rates is similar for men and women.
• C)Changes in stepping rate are positively associated with heart rate.
• D)Step exercise is equally beneficial to men and women.

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