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What do experimenters in psychology use to make sure that groups in an experiment are about...

What do experimenters in psychology use to make sure that groups in an experiment are about equal on variables that may affect the results of an experiment

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In psychology, experimenter use control to make sure that groups in an experiment are about equal on variables that may affect the results of an experiment. Control refers to removing or minimizing the influence of such variables by several methods such as: randomization or random assignment of subjects to groups; matching subjects on extraneous variables and then assigning subjects randomly to groups; making groups that are as homogenous as possible on extraneous variable.

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