To examine the effects of drug therapy on depression, Mark located 45 studies using drug therapy with adults diagnosed with depression. Studies that included other additional treatments were excluded. He performed a statistical analysis of the results of these studies and concluded that drug therapy was effective in treating depression. In this case, Mark has conducted a _____.

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Mark has conducted a meta-analysis, which is a statistical analysis that combines data from multiple studies on the same topic to draw conclusions about the effectiveness of a treatment or intervention. Mark gathered and analyzed data from 45 studies and concluded that drug therapy is effective in treating depression. This is an example of a meta-analysis.

To Examine the Effects of Drug Therapy on Depression, Mark