A medical researcher wants to construct a 99.9% Confidence interval for the proportion of knee replacement surgeries that result in complications.

an article in a medical journal suggested that approximately 16% of such operations result in complications. Using this estimate, what sample size needed so that the confidence interval will have a margin of error of 0.04?

A sample of _____ operations is needed to obtain 99.9% confidence interval with a margin of error of 0.04 using the estimate 0.16 for P