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 5.9 pounds/square inch. it is believed that the valve performs above the specifications. the valve was tested on 24 engines and the mean pressure was 6.1 pounds/square inch with a standard deviation of 1.0. a level of significance of 0.05 will be used. assume the population distribution is approximately normal. make the decision to reject or fail to reject the null hypothesis.