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Regulate water pressure on an automobile engine

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Reference no: EM131717930

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 7.7 lbs/square inch. The valve was tested on 140 engines and the mean pressure was 7.5 lbs/square inch. Assume the variance is known to be 0.64. Is there evidence at the 0.02level that the valve performs below the specifications?

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Reference no: EM131717930

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