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A researcher wishes to estimate the proportion of adults who havehigh-speed Internet access. What size sample should be obtained if she wishes the estimate to

A researcher wishes to estimate the proportion of adults who havehigh-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.04with 95%confidence if

a) she uses a previous estimate of 0.460.46?

b) she does not use any priorestimates?

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