Question: Calculate a mean effect size and its standard error Mazzucchelli Kane

Calculate a mean effect size and its standard error.
Mazzucchelli, Kane, and Rees (2010) examined studies of behavioral activation as a way to improve feelings of subjective well-being. (They defined behavioral activation as “intentional behavioral, cognitive, or volitional activity . . . intended to cultivate positive feelings, behaviors, and/or cognitions.” They report data on 11 studies comparing treatment and control groups. These data are shown below broken down by those who showed minimal symptoms of depression and those who showed elevated symptoms. The results follow.

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