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Practice Problems

# Practice Problems - More Examples An Engineer designed a...

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More Examples An Engineer 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 7.6 lbs/square inch. It is believed that the valve does not perform to the specifications. The valve was tested on 100 engines and the mean pressure was 7.8 lbs/square inch. Is there sufficient evidence to support the claim that the valve does not perform to specifications? Assume the population variance is known to be 0.81 lbs/square inch. A level of significance of 0.02 will be used. 1. There is not sufficient evidence to support the claim that the valve does not perform to the specifications 2. There is sufficient evidence to support the claim that the valve does not perform to the specifications The director of research and development is testing a new drug. She wants to know if there is evidence at the 0.01 level that the drug stays in the system for more than 650 minutes. For a sample of 89 patients, the mean time the drug stayed in the system was 354 minutes. Make a decision to reject or fail to reject the hypothesis. Assume the population variance is known to be 576. Make a decision 1. Reject Null Hypothesis 2.

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