Matching is a method of controlling extraneous variables that involve matching test units on a set of key background variables before assigning them to the treatment conditions.

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Matching is a method of controlling extraneous variables that involve matching test units on a set of key background variables before assigning them to the treatment conditions. This helps to ensure that the treatment and control groups are similar on important variables that could affect the outcome measure.

Matching Is a Method of Controlling Extraneous Variables That Involve