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 4.7 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 5.0 pounds/square inch with a standard deviation of 0.7. a level of significance of 0.01 will be used. assume the population distribution is approximately normal. make the decision to reject or fail to reject the null hypothesis.