10. [-70.55 Points] DETAILS ASWSBE13 8.E.029.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER You may need to use the appr

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10 70 55 Points Details Aswsbe13 8 E 029 Mi My Notes Ask Your Teacher Practice Another You May Need To Use The Appr 1 (117.06 KiB) Viewed 19 times

10. [-70.55 Points] DETAILS ASWSBE13 8.E.029.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER You may need to use the appropriate appendix table or technology to answer this question. Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and pre-preview 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) If we want to estimate the population mean time for previews at movie theaters with a margin of error of 105 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. Need Help? Master It Submit Answer 11. [-70.55 Points] DETAILS ASWSBE13 8.E.036. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER You may need to use the appropriate appendix table or technology to answer this question. According to statistics reported on news source, a surprising number of motor vehicles are not covered by insurance. Sample results, consistent with the news report, showed 56 of 200 vehicles were not covered by insurance. (a) What is the point estimate of the proportion of vehicles not covered by insurance? (b) Develop a 95% confidence interval for the population proportion. (Round your answer to four decimal places.) to 12. [-70.55 Points) DETAILS ASWSBE13 8.E.039.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER You may need to use the appropriate appendix table or technology to answer this question. In the past, 13% of all homes with a stay-at-home parent had the father as the stay-at-home parent. An independent research firm has been charged with conducting a sample survey to obtain more current information. (a) What sample size is needed if the research firm's goal is to estimate the current proportion of homes with a stay-at-home parent in which the father is the stay-at-home parent with a margin of error of 0.03? Use a 95% confidence level. (Round your answer up to the nearest whole number.) (b) Repeat part (a) using a 99% confidence level. (Round your answer up to the nearest whole number.)