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A survey of 1,056 tablet owners was conducted. In response to a survey question about shopping, 27% of tablet owners said they use mobile devices for payment, 21% said they use such devices to make social media comments about their purchases, and 9% said they use such devices to retrieve mobile coupons. Complete parts (a) through (d) below.
a. Construct a 90% confidence interval estimate of the population proportion pi
of tablet owners who said they use mobile devices for payment.
b. Construct a 90% confidence interval estimate of the population proportion pi of tablet owners who said they use mobile devices to make social media comments about their purchases.
c. Construct a 90% confidence interval estimate of the population proportion pi of tablet owners who said they use mobile devices to retrieve mobile coupons.
d. You have been asked to update the results of this study. Determine the sample size necessary to estimate, with 90% confidence, the population proportions in (a) through (c) to within +/- 0.05.