1. Problem Set: Lind 15th edition, chapter 9, problems 12, 13, 14, 44, 45 12 The U.S. Dairy Industry wants to estimate the mean yearly milk consumption. A sample of 16 people reveals the mean yearly consumption to be 60 gallons with a standard deviation of 20 gallons. a. What is the value of the population mean ? What is the best estimate of the value ? b. Explain why we need to use t distribution. What assumption do you need to make ? c. For a 90 percent confident interval, what is the value of t ? d. Develop the 90 percent confidence interval for population mean. e. Would it be reasonable to conclude that the population mean is 63 gallons ? 13 Merrill Lynch Securities and Health Care Retirement Inc. are two large employers in downtown Toledo, Ohio. They are considering jointly offering child care for their employees. As a part of the feasibility study, they wish to estimate the mean weekly child-care cost of their employees. A sample of 10 employees who use child care reveals the following amounts spent last week. 107 92 97 95 105 101 91 99 95 104 Develop a 90 percent confidence interval for the population mean. Interpret the result. 14 The Greater Pittsburgh area Chamber of Commerce wants to estimate the mean time workers who are employed in the downtown area spend getting to work. A sample of 15 workers reveals the following number of minutes spent traveling. 29 38 38 33 38 21 45 34 40 37 37 42 30 29 35 Develop a 98 percent confidence interval for the population mean. Interpret the result. 44 The manufacturer of a new line of ink-jet printers would like to include as part of its advertising the number of pages a user can expect from a print cartridge. A sample of 10 cartridges revealed the following number of pages printed. 2,698 2,028 2,474 2,395 2,372 2,475 1,927 3,006 2,334 2,379 a. What is the point estimate of the population mean? b. Develop a 95 percent confidence interval for the population mean. 45 Dr. Susan Benner is an industrial psychologist. She is currently studying stress among executives of Internet companies. She has developed a questionnaire that she believes measures stress. A score above 80 indicates stress at a dangerous level. A random sample of 15 executives revealed the following stress level scores. 94 78 83 90 78 99 97 90 97 90 93 94 100 75 84 a. Find the mean stress level for this sample. What is the point estimate of the population mean ? b. Construct a 95 percent confidence level for the population mean. c. Is it reasonable to conclude that Internet executives have a mean stress level in the dangerous level, according to Dr. Benner's test ?,Thanks --question # 13 already answered, please help with the other 4 problems.,Thank you !!!,Thank you for answering my question so quickly, I have one question. How do you std dev from raw data when sd is unknown. Please Help !...Thanks,Thank you !!!
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