317 exam 2 Spring 2008 A

317 exam 2 Spring 2008 A - Econ 317 1. Form A Exam 2 Name_...

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Econ 317 Form A Exam 2 Name______________________ 1. Office of Highway Safety (OHS) believes that average speed of traveling over a particular stretch of a highway exceeds the legal speed limit of 70 mph. The following random sample of 8 automobiles’ speeds were recorded on radar: 82 73 77 67 77 86 72 69 a. Test OHS claim using α =0.1. b. Calculate and interpret the p-value (observed significance). c. What assumptions are needed for the validity of your test and why? d. Construct a 90% confidence interval for the population mean. Give a clear interpretation of the interval you estimated.
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2. The U.S. Commission on Crime wishes to estimate the fraction of crimes related to firearms in an area with one of the highest crime rates in the country. The commission randomly selected 342 files of recently committed crimes in the area and found 312 in which a firearm was reportedly used. a. Is sample large enough to construct a meaningful confidence interval? Show your work. b.
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This note was uploaded on 09/11/2008 for the course ECON 317 taught by Professor Safarzadeh during the Spring '07 term at USC.

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317 exam 2 Spring 2008 A - Econ 317 1. Form A Exam 2 Name_...

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