Catherine, a researcher, desires to study child behavior with age, sex, and mental stability as constant variables. She uses level of activity as an independent variable for her study. In this context, Catherine is trying to establish _____.

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Catherine is trying to establish experimental control by keeping age, sex, and mental stability constant while varying the level of activity to study its effect on child behavior. This allows her to isolate the effect of the independent variable (level of activity) on the dependent variable (child behavior) without interference from other variables.

Catherine, a Researcher, Desires to Study Child Behavior with Age