073 - Experiments and Observational Studies Example: WB5-1...

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Experiments and Observational Studies 06/09/2007 09:00:00 Example: WB5-1 Comparing divorced men to married men EXPL: Groups compared = marital status (divorced or married) RESP: Measurement over which the groups are compared = whether or not  alcoholic Type of study: observational A confounding variable is an  extraneous difference  in the groups Example WB5-2 Comparing men who took vitamin C to men who didn’t take vitamin C. But in  different years Confounding variable: Severity of the winter Example WB5-3 “The J-School” causes counseling Confounding variables: J-School is very large compared to other majors, high  percentage of out-of-state students, Journalism may attract “type A”  personalities Example WB5-4 Best detergent Answer: The best detergent depends on the water temperature. Detergent  and temperature interact
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073 - Experiments and Observational Studies Example: WB5-1...

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