A researcher wishes to estimate the proportion of adults who have high-speed internet access. What sample should be obtained if she wishes the estimate to be within 0.01 with 90% confidence if: a. she...

A researcher wishes to estimate the proportion of adults who have high-speed internet access. What sample should be obtained if she wishes the estimate to be within 0.01 with 90% confidence if:

a. she uses a previous estimate of 0.36?
b. she does not use any prior estimates?