To study the general effectiveness of treatment, Smith and Glass and their colleagues performed a(n) :

A) meta-analysis of many studies.
B) analysis of their clinical cases.
C) survey of many clients who had received therapy.
D) controlled study that involved random assignment of subjects to treatment conditions.

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jason chang · Accepted Answer

Final Answer : A, Explanation :  Smith and Glass conducted a meta-analysis, which involves statistically combining the results of many studies to assess the overall effectiveness of a treatment or intervention. This method allows for a broader understanding of the treatment's effectiveness across different studies.

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