Question: Working with sample means. A student project measured the increase in the heart rates of fellow students when they stepped up and down for three

Working with sample means. A student project measured the increase in the heart rates of fellow students when they stepped up and down for three minutes to the beat of a metronome. The explanatory variables are step height (Lo =

5.75 inches, Hi = 11.5 inches) and metronome beat (Slow = 14 steps/minute, Med = 21 steps/minute, Fast = 28 steps/minute). The subject’s heart rate was measured for 20 seconds before and after stepping. The response variable is the increase in heart rate during exercise. The data appear in Table 28.3.4

(a) Display the 6 treatments in a two-way layout.

(b) Find the group means, plot the means, and discuss the interaction and the two main effects.

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