An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 200 engines and the mean pressure was 4.6 pounds/square inch (psi). Assume the population standard deviation is 0.9. If the valve was designed to produce a mean pressure of 4.5 psi, is there sufficient evidence at the 0.02 level that the valve performs above the specifications? Step 5 of 6 : Identify the level of significance for the hypothesis test. Answer Tables Keypad How to enter your answer (opens in new window) Keyboard Shortcuts Previous step answers Submit