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sp01ex1c

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

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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
there sufficient evidence at the 0.01 level to support the mayor's claim?

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