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Assume the variance is known to be 049 is there evidence at

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 7.2 lbs/square inch. The valve was tested on 250 engines and the mean pressure was 7.3 lbs/square inch. Assume the variance is known to be 0.49. Is there evidence at the 0.05 level that the valve performs above the speci?cations?

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Basic Statistics: Assume the variance is known to be 049 is there evidence at

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