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

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 4.1 lbs/square inch. The valve was tested on 170 engines and the mean pressure was 4.0 lbs/square inch. Assume the variance is known to be 0.64. Is there evidence at the 0.05 level that the valve performs below the specifications?

Enter the value of theztest statistic. Round your answer to two decimal places.

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