Read Case Study V: Retrospective Cohort Study of The Association of Congential Malformations and Hazardous Waste on pages 374-378 of your text and discuss the following:
1. What are controls in a research study and how are they used? How are controls used in this study? 2. What are confounding variables and how do they affect a research study? What are the problems and limitations of confounding variables in this study?
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