I need help with A,B

Part 1 of 2 Points: 0 of 1 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 0.05 with 90% confidence if (a) she uses a previous estimate of 0.36? (b) she does not use any prior estimates? Click the icon to view the table of critical values. (a) n= (Round up to the nearest integer.) - X Table of critical values Level of Confidence, Area in Each Tail, MIR Critical Value, (1 - a) -100% 90% 0.05 1645 95% 0.025 196 99% 0.005 2 575 Print Done