The meta-analysis conducted by Kazdin and colleagues in 1990 found that treatment studies often used ________ samples and that they were treated in a(n)_________ format.

Question

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Kazdin and colleagues found that treatment studies often used volunteer samples and that they were treated in a group format, as opposed to referring clients and treating them on an individual basis.

The Meta-Analysis Conducted by Kazdin and Colleagues in 1990 Found