Question: An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 280 engines and the mean

An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 280 engines and the mean pressure was 6.5 lbs/square inch. Assume the variance is known to be 0.64. If the valve was designed to produce a mean pressure of 6.6 lbs/square inch, is there sufficient evidence at the 0.02 level that the valve does not perform to the specifications?

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