A researcher wishes to estimate the proportion of adults who have high speed Internet access What size sam should be obtained if she wishes the estimate to be within 0 05 with 99 confidence if a she uses a previous estimate of 0 48 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 Level of Confidence 1 a 100 90 95 99 Area in Each Tail 0 05 0 025 0 005 Critical Value z 1 645 1 96 2 575 X