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Mathematics, 15.11.2019 19:31 villarrealc1987

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 7.5 pounds/square inch (psi). assume the population standard deviation is 1.0. the engineer designed the valve such that it would produce a mean pressure of 7.6 psi. it is believed that the valve does not perform to the specifications. a level of significance of 0.1 will be used. find the value of the test statistic. round your answer to two decimal places.

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