A research procedure in which a variable is manipulated and the manipulation's effect on another variable is observed is called a(n):

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An experiment involves manipulating one variable to determine if changes in one variable cause changes in another variable. This is a fundamental aspect of experimental research, distinguishing it from observational studies, case studies, and correlational research, where variables are not manipulated by the researcher.

A Research Procedure in Which a Variable Is Manipulated and the Manipulation's