Study and address possible threats to internal validity

Reference no: EM13340289

You read in a health magazine about a study in which a new therapy technique for depression was examined. A group of depressed individuals volunteered to participate in the study, which lasted nine months. There were 50 participants at the beginning of the study and 29 at the end of the 9 months. The researchers claimed that of those who completed the program, 85% improved. Critique this study and address possible threats to internal validity.

Reference no: EM13340289

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