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In 1980, Mary Lee Smith, Gene Glass, and Thomas Miller published a comprehensive summary of hundreds of experiments that utilized random assignment to compare treatment and control conditions in psychotherapy. Their findings demonstrated that psychotherapy is generally highly effective, revealing that approximately $$80\%$$ of participants receiving treatment showed greater improvement than the average participant in a control group.

Smith, Glass, and Miller's 1980 Psychotherapy Effectiveness Study

In their landmark 1980 summary of hundreds of psychotherapy experiments, Smith, Glass, and Miller found that approximately ____% of participants who received psychotherapy showed greater improvement than the average participant in a control group.

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