Question

A researcher wishes to estimate the proportion of adults who have​ high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.03 with 99​% confidence if

​(a) she uses a previous estimate of 0.36​?
​(b) she does not use any prior​ estimates?

Answer 1

This answer must be A because she has to take an estimate previously so that she can estimate the new estimate. So my answer is ( A )