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The employee benefits manager of a large public university would like to estimate the proportion of fulltime employees who prefer adopting the first (plan A)
The employee benefits manager of a large public university would like to estimate the proportion of fulltime employees who prefer adopting the first (plan A) of three available health care plans in the next annual enrollment period. A random sample of the university's employees and their tentative health care preferences are given in the file P08_16.xlsx.
a. Calculate a 90% confidence interval for the proportion of all the university's employees who favor plan A.
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