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Mathematics, 01.10.2019 19:20 rtryf57rfgth

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 pounds/square inch. it is believed that the valve performs above the specifications. the valve was tested on 120 engines and the mean pressure was 4.3 pounds/square inch. assume the variance is known to be 0.64. a level of significance of 0.05 will be used. make a decision to reject or fail to reject the null hypothesis. make a decision.

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