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PUBH/HLSC 445 Health Research Services Methods: Class Chapters 10-12 Case-Control Studies, Cohort Studies, and Experimental Studies Essay For cohort studies, the most common measure of association is the incidence rate ratio, reported as RR which compares the incidence rate among the exposed to the incidence rate in the unexposed. The point estimate provides an interpretation of the RR (RR> 1 RR=1, RR<1). The 95% confidence interval (CI) (CI<1, CI>1, CI overlaps RR) for the point estimate indicates whether the calculated RR is statistically significant. Describe the interpretation of the RRs and then describe the confidence interval. (The photo is for this question) Randomization is the assignment of participants to an exposure group in an experimental study using a chance-based method that minimizes the several types of possible bias. A variety of approaches can be used to randomly allocate participants to an active intervention group of control. Define three random approaches and discuss how and when it is used. a. Simple randomization b. Stratified randomization c. Block randomization

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