Go to Youtube and search for: We Were There - Polio. You should see a video put out by the CDC.  About 16 minutes into the presentation you’ll find a table of data from a 1954 clinical trial of Inactivated Polio Vaccine. Use the data to estimate the placebo effect in the study by estimating the Relative Risk of paralysis (placebo versus not inoculated), rounding off your final answer (but not the intermediate numerator and denominator computations) to the nearest hundredth.

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