A researcher wishes to estimate the proportion of adults who haveâ€‹ high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.01 with 90â€‹% confidence if
â€‹(a) she uses a previous estimate of 0.58?
(b) she does not use any prior estimates?
(a) n = ____ (Round up to the nearest integer.)
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