MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Provide an appropriate response. 1) In order to fairly set flat rates for auto mechanics, a shop foreman needs to estimate the average 1) time it takes to replace a fuel pump in a car. How large a sample must he select if he wants to be 99% confident that the true average time is within 15 minutes of the sample average? Assume the standard deviation of all times is 30 minutes A) 27 B) 6 C) 26 D) 5 2) A group of 40 bowlers showed that their average score was 192. Assume the population standard 2) deviation is 8. Find the 95% confidence interval of the mean score of all bowlers. A) (187.3, 196.1) B) (189.5, 194.5) C) (186.5, 197.5) D) (188.5, 195.6) 3) Construct a 95% confidence interval for the population mean, J. Assume the population has a 3) normal distribution. A sample of 25 randomly selected students has a mean test score of 81.5 with a standard deviation of 10.2. A) (56.12, 78.34) B) (66.35, 69.89) C) (87.12, 98.32) D) (77.29, 85.71) SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 4) The number of wins in a season for 32 randomly selected professional football teams are 4) listed below. Construct a 90% confidence interval for the true mean number of wins in a season. 9 9 9 8 8 10 9 7 2 11 10 6 4 11 9 8 8 12 10 7 5 12 6 4 3 12 9 9 7 10 7 7 5 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 5) A survey of 280 homeless persons showed that 63 were veterans. Construct a 90% confidence 5) interval for the proportion of homeless persons who are veterans. A) (0.161, 0.289) B) (0.184, 0.266) C) (0.167, 0.283) D) (0.176, 0.274)