n HELD Mtge-r 23. Customers arrive at a movie theater at the advertised movie time onlyr to find that the].r have to sit through several previews and prepreview ads before the movie starts. Many complain that the time devoted to previews is too long [The Willi Street Journal, lIIIIIctoher 12, 2012}. A preliminaryr sample conducted hr The 1i-v'oll Street Journal showed that the standard deviation of the amount of time devoted to previews was 4 minutes. Use that as a planning value for the standard deviation in answering the following questions. 1. If we want to estimate the population mean time for previews at movie theaters with a margin of error of TE seconds, what sample size should he used? Assume 95% confidence. 2. 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 he used? Assume 95% confidence