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Question 1 / 8:  To study the question of whether unemployment leads to a higher risk of cardiovascular disease, which study design would be better - a randomized controlled trial or a cohort study? What is your reasoning?
Answer: 
It would not be feasible or ethical to randomize volunteers to a state of unemployment. Therefore, the only feasible/ethical study design would be a cohort study.
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Epidemiology & Biostatistics Cohort Studies

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Attribution:  Janet, E.A. Forrester, Kwan Ho Kenneth Chui, Steven Cohen, Michael D. Kneeland, Alice Tang, David Tybor. Epidemiology and Biostatistics 2010. (Tufts University OpenCourseWare), http://ocw.tufts.edu/Course/65/ (Accessed 3 May, 2014). License: Creative Commons BY-NC-SA
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