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An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 170 engines and the mean

An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 170 engines and the mean pressure was 4.7lbs/square inch. Assume the variance is known to be 11. If the valve was designed to produce a mean pressure of 4.5lbs/square inch, is there sufficient evidence at the 0.05 level that the valve does not perform to the specifications?

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