Manipulating one or two factors while holding others constant is the essence of

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Manipulating one or two factors while holding others constant is known as experimental control. This allows for the identification of the specific factors that are causing changes in the dependent variable. Independent variables are the factors being manipulated while dependent variables are the factors being measured or observed. Random sampling refers to the method of selecting participants for a study in a way that ensures that each member of the population has an equal chance of being included. Thus, the best choice is C - experimental control.

Manipulating One or Two Factors While Holding Others Constant Is