An engineer 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 6.4 lbs/square inch. The valve was tested on 180 engines and the mean pressure was 6.2 lbs/square inch. Assume the variance is known to be 1.00. Is there evidence at the 0.1 level that the valve does not perform to the specifications?

Enter the hypotheses: