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sp01ex1c - COURSE MSCI 3710 EXAM 1 Version C SEMESTER...

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COURSE: MSCI 3710 Print Name: EXAM 1 Signature: Version C S.S.#: SEMESTER: Spring 2001 Section Number: Note: Whenever question(s) are connected you may be asked to assume a result (given a value) from the previous question but this result may or may not be correct. This is to prevent you from losing points on a second question because you made a mistake on a previous question. Use the information given in the paragraph below to answer the next three questions . Instructions: n Please print your name, social security number, and section number on this exam. Also, put your signature on this exam. P On your scantron PRINT your name, your version, and your section number. To better protect your privacy also print your name on the backside of your scantron. P You have 75 minutes to complete this exam. The exam is open book, open notes, and open mind. You may use any type of calculator but please show all your work on the exam and mark all answers on the scantron. P Many of the questions follow the format of those in Adventures in Business Statistics. The remaining questions are either based on the Excel assignment or use an Adventures-like approach with problems nearly identical to those assigned in the textbook. P When you have completed the exam, please insert your scantron into the exam booklet and turn them in to your instructor. P No cheating. P Good luck and we wish you well on the exam. 1
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An engineer has designed a valve that will regulate water pressure on an automobile engine. The engineer designed the valve such that it would produce a mean pressure of 7.3 lbs./sq. inch. The valve was tested on 150 engines and the average pressure was 7.2 lbs./sq. inch with a variance of 0.36 lbs./sq. inch. Is there evidence at the 0.10 level that the valve does not perform to the specifications? 1. What are the null hypothesis and alternative hypothesis for this test? A. Ho: μ = 7.2 Ha: μ P< 7.2 B. Ho: μ 7.3 Ha: μ < 7.3 C. Ho: μ = 7.2 Ha: μ 7.2 D. Ho: μ > 7.3 Ha: μ 7.3 E. Ho: μ = 7.3 Ha: μ 7.3 * 2. What is the calculated value of the test statistic? 3. Assuming the calculated value of the test statistic is 2.00, what are the decision and conclusion of the test? Use the information given in the paragraph below to answer the next two questions . The mayor of a town believes that above 34% of the residents favor annexation of an adjoining community. A sample of 900 voters showed that 37% favored annexation. Is 2
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there sufficient evidence at the 0.01 level to support the mayor's claim?
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