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An engineer has designed a valve that will regulate water pressure on an automobile engine. The...

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Statistics

An engineer has designed a valve that will regulate waterpressure on an automobile engine. The valve was tested on 130engines and the mean pressure was 7.6 lbs/square inch. Assume thestandard deviation is known to be 1. If the valve was designed toproduce a mean pressure of 7.7 lbs/square inch, is there sufficientevidence at the 0.05 level that the valve does not perform to thespecifications? State the null and alternative hypotheses for theabove scenario.

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