Question

Professor Mann wants to know if nutrition predicts athlete's performance on the field. Which of the...

Professor Mann wants to know if nutrition predicts athlete's performance on the field. Which of the following might be a good control variable in this study?

swimmers

academic achievement

college students

prior athletic performance
Math   Statistics-And-Probability   
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Answer #1

Solution: The good control variable in this study is:

prior athletic performance

Explanation: The control variable is one which is held constant so that it does not influence the outcomes of the experiment. In the given example, the researcher is trying to see the effect of nutrition on the athlete's performance. The independent variable is nutrition and the dependent variable is an athlete's performance. If we don't control the prior athletic performance, the experiment becomes invalid because we may be seeing the effect of prior athletic performance on the athlete's performance. Therefore, the control variable in the given situation is prior athletic performance

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