Therapists evaluate the effectiveness of therapy by averaging the results of a large number of studies to determine an overall level of effectiveness. This method of investigating treatment effectiveness is called________.

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Meta-analysis involves the statistical analysis of results from multiple studies to identify patterns and overall effects. This method is commonly used in the field of psychology to evaluate the effectiveness of different therapeutic interventions. The other choices are not specific to this method of investigating treatment effectiveness.

Therapists Evaluate the Effectiveness of Therapy by Averaging the Results