Question: An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on150 150engines and the mean pressure

An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on150

150engines and the mean pressure was6.3

6.3pounds/square inch (psi). Assume the population variance is0.49

0.49. The engineer designed the valve such that it would produce a mean pressure of6.2

6.2psi. It is believed that the valve does not perform to the specifications. A level of significance of0.05

0.05will be used. Find the value of the test statistic. Round your answer to two decimal places.

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