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 4.1 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 4.5 pounds/square inch with a variance of 0.64. A level of significance of 0.05 will be used. Assume the population distribution is approximately normal. Required:
Make the decision to reject or fail to reject the null hypothesis.