A meta-analysis in 1980 examined the results of 475 separate studies of the effectiveness of psychotherapy. What did the researchers conclude on the basis of their meta-analysis?
A) Overall, behavior therapies were more effective than psychoanalytic therapies.
B) Lengthy treatments were, on average, more effective than brief treatments.
C) The typical client was better off than 75% of individuals who were not treated.
D) all of the above
Correct Answer:
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