Safari File Edit View History Bookmarks Window Help 0 8 0 7 Q Mon Apr 25 8: .. . D h GO webassign.net C + AccessUH Hum Tum - Ep 23 - 25 Apr 22 - Presente. MA Exam 4 - TMTH 3360-2 (20948), section.. Homework Help - Q&A from Online Tutor. 4 OnlineAssignments 14. [-/6 Points] DETAILS MENDSTAT14 8.E.025. MY NOTES ASK YOUR TE Find a 90% confidence interval for a population mean , for these values. (Round your answers to three decimal places.) (a) n = 145, x = 0.84, s2 = 0.086 to (b) n = 40, x = 20.2, s = 3.98 to (c) Interpret the intervals found in part (a) and part (b). In repeated sampling, 10% of all intervals constructed in this manner will enclose the population proportion. There is a 90% chance that an in proportion will fall within the interval. In repeated sampling, 90% of all intervals constructed in this manner will enclose the population mean. There is a 10% chance that an individual sample proportion will fall within the interval. 90% of all values will fall within the interval You may need to use the appropriate appendix table or technology to answer this question. MY NOTES ASK YOUR TEACH 15. [-/4 Points] 1 DETAILS MENDSTAT14 8.E.037. A sample survey is designed to estimate the proportion of sports utility vehicles being driven in the state of California. A random sample of 500 registrations are selected from a Department of Motor Vehicles database, and 23 are classified as sports utility vehicles. (a) Use a 95% confidence interval to estimate the proportion of sports utility vehicles in California. (Round your answers to three decimal places.) (b) How can you estimate the proportion of sports utility vehicles in California with a higher degree of accuracy? (HINT: There are two answers. Select all that apply.) increase the sample size n decrease za/2 by decreasing the confidence coefficient increase za/2 by decreasing the confidence coefficient decrease the sample size n increase za/2 by increasing the confidence coefficient decrease za/2 by increasing the confidence coefficient conduct a non-random sample You may need to use the appropriate appendix table or technology to answer this question. MY NOTES ASK YOUR TEACHER 16. [-/5 Points] DETAILS MENDSTAT14 8.E.081. Suppose you wish to estimate the difference between the mean acidity for rainfalls at two different locations, one in a relatively unpolluted area and the other in an area subject to heavy air pollution. If you wish your estimate to be correct to the nearest 0.1 pH, with probability near 0.90, pproximately how many rainfalls (PH values) would have to be included in each sample? (Assume that the variance of the pH measurements is approximately 0.3 at both locations and that the samples will be of equal size. Round your answer up to the nearest whole number.) 24,972 APR W G BLAN O 25Safari File Edit View History Bookmarks Window Help 0 8 1 7 9 8 Mon Apr 25 8:58 PM . . .