A Researcher Wished to Compare the Effect of the Different

question 45

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. What are the advantages of studying the two factors simultaneously in the same experiment?

• A)It is more efficient to study two factors simultaneously rather than separately.
• B)We can reduce the residual variation in a model by including a second factor thought to influence the response.
• C)We can investigate the interaction between factors.
• D)All of the above

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