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

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 9 months. There were 50 subjects 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. What possible confounds can you identify in this study and how can they be corrected? Or can they? Review the internal and external threats to validity in the example from Part 1 of this Forum. Identify and define those threats that are related to measurement, and the threats that are related to sampling issues.

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