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6. [-5 Points] ASWSBE14 B.E.029.MI. ASK YOUR TEACHER PRACTICE ANOTHER 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 6 minutes. Use that as a planning value for the standard deviation in answering the Following questions. (Round your answers up to the nearest whole number.) (a) You may need to use the appropriate appendix table or technology to answer this question. If we want to estimate the population mean time for previews at movie theaters with a margin of error of 105 secondsr what sample size should be used? Assume 95% confidence. |:l (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% condence. |:| Need Help? 7. [-/4 Points] DETAILS ASWSBE14 8.E.034. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER You may need to use the appropriate appendix table or technology to answer this question. At 95% confidence, how large a sample should be taken to obtain a margin of error of 0.08 for the estimation of a population proportion? Assume that past data are not available for developing a planning value for p*. (Round your answer up to the nearest whole number.) Need Help? Read It