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A football coach hears that a new exercise program will increase upper body strength better...

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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 coach s plan violate Comparison Random assignment Control None The experiment includes all of the principles of experimental design Replication

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