Mary Marsh, head aerobic instructor at Tuff-it-Out Fitness Centers, wanted to estimate the proportion of all 19-39 year olds who aerobically exercise at least once each week. Mary would like the estimate to be within plus or minus 5% points of the mean and she would like to have 90 percent confidence (z=1.645) in her results.  Mary estimates the population proportion at 40%. 

Calculate the required sample size and show details of your work

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To calculate the required sample size for estimating a population proportion with a ... View the full answer