sp01ex1b

sp01ex1b - COURSE: MSCI 3710 EXAM 1 Version B 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 6.9 lbs./sq. inch. The valve was tested on 160 engines and the average pressure was 6.8 lbs./sq. inch with a variance of 0.49 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 = 6.8 Ha: μ P< 6.8 B. Ho: μ 6.9 Ha: μ < 6.9 C. Ho: μ = 6.8 Ha: μ 6.8 D. Ho: μ > 6.9 Ha: μ 6.9 E. Ho: μ = 6.9 Ha: μ 6.9 * 2. What is the calculated value of the test statistic? A. 2.58 B. –3.40 C. 3.40 D. –1.81* E. 2.42 3. Assuming the calculated value of the test statistic is 2.50, what are the decision and conclusion of the test? A. Fail to reject the null hypothesis, conclude there is insufficient evidence of Ha. B. Fail to reject the null hypothesis, conclude there is evidence of Ha. C. Reject the null hypothesis, conclude there is evidence of Ha. * D. Reject the null hypothesis, conclude there is evidence of Ho. E. Reject the null hypothesis, conclude there is insufficient evidence of Ha. Use the information given in the paragraph below to answer the next two questions . The mayor of a town believes that above 25% of the residents favor annexation of an
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This note was uploaded on 03/09/2011 for the course DSC 3710 taught by Professor Staff during the Spring '09 term at North Texas.

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sp01ex1b - COURSE: MSCI 3710 EXAM 1 Version B SEMESTER:...

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