A Researcher Wished to Compare the Effect of the Different

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.