Insomnia, at last Exercises 10, 22, and 24 describe an experiment investigating the
Chapter 12, Problem 26(choose chapter or problem)
Insomnia, at last Exercises 10, 22, and 24 describe an experiment investigating the effectiveness of exercise in combating insomnia. Suppose some of the 40 subjects had maintained a healthy weight, but others were quite overweight. Why might researchers choose to block the subjects by weight level before randomly assigning some of each group to the exercise program?
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