Question

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 4.2 pounds /square Inch. It believed that the valve performs above the specifications . The valve was tested on 170 engines and the mean pressure was 4.4 pounds/square inch. Assume the standard deviation is known to be 1.0. A level of significance of 0.02 will be used Determine the decision 
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Answer 1

Explanation:

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Answer 2

Answer:

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Explanation:

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