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

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An engineer has designed a valve that will regulate water pressure on an automobile engine The valve was tested on 160 engines and the mean pressure was 7 9 lbs square inch Assume the variance is known to be 0 36 If the valve was designed to produce a mean pressure of 7 8 lbs square inch is there sufficient evidence at the 0 01 level that the valve performs above the specifications State the null and alternative hypotheses for the above scenario Answer Ho H Keypa Keyboard Shortc Tables

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