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 95% confidence if (a) she uses a previous estimate of 0.46? (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.) (b) n = (Round up to the nearest integer.) Table of critical values a Level of Confidence, Area in Each Tail, Critical Value, (1 - a)-100% 90% 0.05 1.645 95% 0.025 1.96 99% 0.005 2.575 Print Done