A researcher decides to use only participants that weigh between 150 and 160 pounds in an experiment comparing two treatment conditions. For this study, what method is being used to control participant weight?

Question

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Holding constant involves controlling a variable by keeping it the same for all participants in a study. In this case, the researcher is controlling participant weight by only including individuals who weigh between 150 and 160 pounds, thus keeping the weight variable constant across the study.

A Researcher Decides to Use Only Participants That Weigh Between