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23. Out of 67,410 surgeries tracked in a study in the U.K., 2832 were followed by surgical site infec- tions (Coello et al. 2005). a. What is a 95% confidence interval for the proportion of surgeries followed by surgical site infection in the U.K.? Assume that the data are a random sample. b. If the study had followed a total of only 674 surgeries from the same population, would the confidence interval have been wider or narrower?
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