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

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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 6.1 pounds/square inch. It is
believed that the valve performs above the specifications. The
valve was tested on 26 engines and the mean pressure was 6.4
pounds/square inch with a standard deviation of 0.6. A level of
significance of 0.05 will be used. Assume the population
distribution is approximately normal. Determine the decision rule
for rejecting the null hypothesis. Round your answer to three
decimal places.