12. Nielsen Media Research wants to estimate the mean amount of time (in minutes) that college students spend surfing the web each weekday. What sample size is necessary to estimate this mean with a 15-minute margin of error at a 98% level of confidence? Assume that a pilot study estimated the population standard deviation to be 112.2 minutes.
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Find the indicated sample size. Nielsen Media Research wants to estimate the mean amount of time (in minutes) that full-time college students spend watching television each weekday. Find the sample size necessary to estimate that mean with a 15-min margin of error. Assume that a $96 \%$ confidence level is desired. Also assume that a pilot study showed that the standard deviation is estimated to be 112.2 min.
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Nielsen Media Research wants to estimate the mean amount of time (in hours) that full-time college students spend watching television each weekday. Find the sample size necessary to estimate that mean with a 0.25 h (or 15 min) margin of error. Assume that a 96% degree of confidence is desired. Also assume that a pilot study showed that the standard deviation is estimated to be 1.87 hours.
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