An engineer has designed a valve that will regulate water
pressure on an automobile engine. The...
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An engineer has designed a valve that will regulate waterpressure on an automobile engine. The valve was tested on 140engines and the mean pressure was 7.7 lbs/square inch. Assume thevariance is known to be 0.64. If the valve was designed to producea mean pressure of 7.9lbs/square inch, is there sufficient evidenceat the 0.1 level that the valve does not perform to thespecifications?
State the null and alternative hypotheses for the abovescenario.
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Solution Given thatPopulation mean 79Sample mean 77Population standard deviation 08Sample
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