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The valve was tested on 110 engines and the mean pressure was 4.6 lbs/square inch. Assume...

The valve was tested on 110 engines and the mean pressure was 4.6 lbs/square inch. Assume the standard deviation is known to be 0.8. If the valve was designed to produce a mean pressure of 4.5 4.5 lbs/square inch, is there sufficient evidence at the 0.02 0.02 level that the valve does not perform to the specifications?

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