Smith and Glass used __________ to study the effectiveness of psychotherapy. This technique combines the results of many studies in a given area of investigation to identify overall patterns and reach stronger data-based conclusions.

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Smith and Glass utilized meta-analysis in their study on the effectiveness of psychotherapy. Meta-analysis is a statistical technique that combines the results of multiple studies to identify overall trends and draw more robust conclusions from the data.

Smith and Glass Used __________ to Study the Effectiveness of Psychotherapy