A researcher uses matching to constitute a control group, while performing a study on psychotherapy as an adjunct treatment for substance addiction. What type of validity might be enhanced by matching, in this instance?

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Matching participants in the experimental and control groups helps to ensure that the groups are equivalent on certain variables, which reduces confounding variables and enhances the internal validity of the study. This makes the results more likely to be due to the intervention rather than differences between the groups.

A Researcher Uses Matching to Constitute a Control Group, While