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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 0.28? (b) she does not use any prior estin Click the icon to view the table of critical values, - X Table of critical values (alin =(Round up to the nearest integer Level of Confidence, Area in Each Tail," Critical Value, z (byn=(Round up to the nearestinteger (1 - 4) - 100% 90% 0.05 1.645 95% 0.025 1,96 99% 0.005 2.575 Print Done Time Remaining: 02 28 13 Next