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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 0.02 with 95% confidence if (a) she uses a previous estimate of 0.56? (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.)

Х Table of critical values Q Area in Each Tail, 2 Critical Value, za - Level of Confidence, (1 - a). 100% 90% 95% 99% 0.05 1.645 0.025 1.96 2.575 0.005