An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 240240 engines and the mean pressure was 5.35.3 pounds/square inch (psi). Assume the population standard deviation is 1.01.0. If the valve was designed to produce a mean pressure of 5.25.2 psi, is there sufficient evidence at the 0.050.05 level that the valve performs above the specifications? p value

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