Researchers want to test whether mountain climbing will increase strength, perceived competence, and immune functioning in juvenile delinquents.  A one-week mountain climbing expedition to Mount Whitney is planned.  Twenty-five male adolescents in a Los Angeles County rehabilitation facility volunteered for the project.  Twenty five male adolescents from a San Diego County rehabilitation facility will be randomly selected to serve as a control group.  The project will begin August 8 and end August 15.  All subjects will be tested daily at 5 p.m. on: (1) strength as measured using a dynamometer which is a valid measure of grip strength, (2) perceived competence as measured by a self-designed questionnaire that asks subjects to respond to an adjective checklist using a Likert-type scale, and (3) immune functioning as measured by the volume of t-cells in blood samples.

In your workbook identify the independent and dependent variables.  Identify and discuss the threats to internal validity.  How would you improve this study?

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During experiments in Psychology the Independent variables are their power to ... View the full answer