Ethanpaul4549 Ethanpaul4549
  • 21-11-2022
  • Mathematics
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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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