An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 170 engines and the mean
pressure was 4.7 pounds/square inch (psi). Assume the population variance is 1.00. The engineer designed the valve such that it would produce a
mean pressure of 4.5 psl. It is believed that the valve does not perform to the specifications. A level of significance of 0.05 will be used. Make the
decision to reject or fail to reject the null hypothesis.