Exam 2a Sp 06 KEY - ECON 2843 010 Exam 2 Spring 2006 Form A...

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Name KEY Exam 2 ID # Spring 2006 Lab Instructor Form A Lab Meeting Time Students must show all work on problems that involve calculation, even if the answer is multiple choice. Questions 1 – 4 refer to the following. A time study at a large automobile assembly plant was undertaken to determine the average time required to assemble an automobile. A random sample of 15 completed automobiles gave a mean assembly time of 12.2 hours and a standard deviation of 2.4 hours. Assume automobile assembly times are normally distributed. 1. Construct a 95 percent confidence interval for the population mean assembly time for automobiles. a. (10.8241 , 13.5759) b. (10.8708 , 13.5292) * c. (10.9428 , 13.4572) d. (10.9854 , 13.4146) 2. Write an interpretation of the confidence interval that was computed in problem 1. In a repeated sampling procedure, 95 percent of the intervals computed in this manner will contain the true population mean μ . 1
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Exam 2a Sp 06 KEY - ECON 2843 010 Exam 2 Spring 2006 Form A...

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