Question

Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and prepreview ads before the movie starts. Many complain that the time devoted to previews is too long. A preliminary sample conducted by The Wall Street Journal showed that the standard deviation of the amount of time devoted to previews was five minutes. Use that as a planning value for the standard deviation in answering the following questions. a. If we want to estimate the population mean time for previews at movie theaters with a margin of error of 78 seconds, what sample size should be used? Assume 95% confidence. b. If we want to estimate the population mean time for previews at movie theaters with a margin of error of 1 minute, what sample size should be used? Assume 95% confidence.

Answer 1

given data are:-

population sd () = 5

z critical value for 95% confidence level, both tailed test be:-

a).margin of error (E) = 78 sec= 78/60 minutes = 1.3 minutes.

the needed sample size be:-

b).margin of error (E) =1 minute

the needed sample size be:-

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answered by: anonymous