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

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Statistics

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 4.2 4.2 pounds/square inch. Itis believed that the valve performs above the specifications. Thevalve was tested on 240 240 engines and the mean pressure was 4.34.3 pounds/square inch. Assume the variance is known to be 0.640.64 . A level of significance of 0.02 0.02 will be used. Determinethe decision rule. Enter the decision rule.

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Since the sample size is 240 which us much greater than 30 hencewe will use Z statistic here assuming    See Answer
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