An engineer has designed a valve that will regulate water pressure on an automobile engine.The engineer designed the valve such that it would produce a mean pressure of 6.8 pounds/square inch.The valve was tested on 23 engines and the mean pressure was 6.4 pounds/square inch with a standarddeviation of 0.7. Is there evidence at the 0.025 level that the valve performs below the specifications?Assume the population distribution is approximately normal.

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An engineer has designed a valve that will regulate water pressure on an automobile engine.The engineer designed the valve such that it would produce a mean pressure of 6.8 pounds/square inch.The valve was tested on 23 engines and the mean pressure was 6.4 pounds/square inch with a standarddeviation of 0.7. Is there evidence at the 0.025 level that the valve performs below the specifications?Assume the population distribution is approximately normal.

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