Suppose You Wish to Determine Whether Exercising Increases Academic Achievement

Suppose you wish to determine whether exercising increases academic achievement.What would be the best approach to take?

A) Compare the achievements of athletes with those of nonathletes.
B) Compare the achievements of baseball players with those of track and field athletes.
C) Compare treatment and control groups in a randomized trial.
D) Compare yourself with a friend who exercises less.

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