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 0.03 with 90% confidence if (a) she uses a previous estimate of 0.34? (b) she does not use any prior estimates?
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We know that the researcher wants to estimate the proportion of adults with high-speed Internet access within 0.03 with 90% confidence. This means that the margin of error (E) is 0.03, and the confidence level is 90%. Show more…
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