Stronger players A football coach hears that a new exercise program will increase

Chapter 4, Problem 61

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QUESTION:

Stronger players A football coach hears that a new exercise program will increase upper-body strength better than lifting weights. He is eager to test this new program in the off-season with the players on his high school team. The coach decides to let his players choose which of the two treatments they will undergo for 3 weeks exercise or weight lifting. He will use the number of push-ups a player can do at the end of the experiment as the response variable. Which principle of experimental design does the coachs plan violate? Explain how this violation could lead to confounding.

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QUESTION:

Stronger players A football coach hears that a new exercise program will increase upper-body strength better than lifting weights. He is eager to test this new program in the off-season with the players on his high school team. The coach decides to let his players choose which of the two treatments they will undergo for 3 weeks exercise or weight lifting. He will use the number of push-ups a player can do at the end of the experiment as the response variable. Which principle of experimental design does the coachs plan violate? Explain how this violation could lead to confounding.

ANSWER:

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The experiment is done by the coach to decide which of the two treatments the players will undergo for 6 weeks - exercise or weight lifting. He let the players decide themselves which treatments they want. He used the number of push-ups a player can do at the end of the experiment as the response variable.

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