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

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Basic Math

An engineer designed a valve that will regulate water pressureon an automobile engine. The engineer designed the valve such thatit would produce a mean pressure of 7.2 pounds/square inch. It isbelieved that the valve performs above the specifications. Thevalve was tested on 250 engines and the mean pressure was 7.3pounds/square inch. Assume the standard deviation is known to be0.9. A level of significance of 0.1 will be used. Determine thedecision rule.

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