MY NOTES ASK YOUR TEACHER 1. (-/3 Points) DETAILS ASWESBE9 B.E.003. You may need to use the appropriate appendix table or technology to answer this question A simple random sample of 90 items resulted in a sample mean of 60. The population standard deviation is om 15 (a) Compute the 95% confidence interval for the population mean (Round your answers to two decimal places.) to (b) Assume that the same sample mean was obtained from a sample of 100 items. Provide a 95% confidence interval for the population mean (Round your answers to two decimal places) (c) What is the effect of a larger sample size on the interval estimate? A larger sample sam provides a smaller margin of error A larger sample size does not change the margin of error A larger sample sise provides a larger margin of error 2. [-/3 points) DETAILS ASWESBE9 8.1.013 MY NOTES ASK YOUR You may need to use the appropriate appendix table or technology to answer this question The following sample data are from a normal population: 8, 6, 10, 13.11.9.4.3. (a) What is the point estimate of the population mean? (b) What is the point estimate of the population standard deviation? (Round your answer to three decimal places.) (c) with 95% confidence, what is the margin of error for the estimation of the population mean? (Round your answer to one decimal place.) (cWhat is the 95% confidence interval for the population mean? (Round your answer to one decimal place.) 3. [-/3 Points DETAILS ASWESBE9 8.E.029.M1. MY NOTES ASK YOUR TEACHER 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 st 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 4 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) it we want to estimate the population mean time for previews at movie theaters with a margin of error of 75 seconds, what sample size should be used? Assume95 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 side should be used? Assume 99% confidence MY NO 4. [-/3 points) DETAILS ASWESBE9 8.6.031 You may need to use the appropriate appendix table or technology to answer this question. A simple random sample of 400 individuals provides 132 Yes responses. (a) What is the point estimate of the proportion of the population that would provide Yes responses? (b) What is your estimate of the standard error of the proportion, an? (Round your answer to four decimal places.) (c) Compute the 95% confidence interval for the population proportion (Round your answers to four decimal places.) to