Kouger6257 Kouger6257

21-10-2022
Mathematics

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an engineer has designed a valve that will regulate water pressure on an automobile engine. the valve was tested on 280280 engines and the mean pressure was 6.86.8 lbs/square inch. assume the standard deviation is known to be 0.90.9. if the valve was designed to produce a mean pressure of 6.76.7 lbs/square inch, is there sufficient evidence at the 0.050.05 level that the valve does not perform to the specifications? state the null and alternative hypotheses for the above scenario

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