Mathematics, 30.03.2020 23:18 noeltan12031
An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 200 engines and the mean pressure was 5.4 lbs/square inch. Assume the standard deviation is known to be 0.8. If the valve was designed to produce a mean pressure of 5.5 lbs/square inch, is there sufficient evidence at the 0.05 level that the valve does not perform to the specifications
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