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 of5.4

5.4pounds/square inch. It is believed that the valve performs above the specifications. The valve was tested on8

8engines and the mean pressure was5.9

5.9pounds/square inch with a variance of0.49

0.49. A level of significance of0.025

0.025will be used. Assume the population distribution is approximately normal. Make the decision to reject or fail to reject the null hypothesis.