Correct An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 210 engines and the mean pressure was 5,0 pounds/square inch (psi), Assume the population standard deviation is 0.9. The engineer designed the valve such that it would produce a mean pressure of 4.9 psi. It is believed that the valve does not perform to the specifications, A level of significance of 0.02 will be used. Find the value of the test statistic. Round your answer to two decimal places. Answer Tables Keypad How to enter your answer (opens in new window) Keyboard Shortcuts