13/21 Question S of 5, Step 1 of 6 Correct 3 An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 180 engines and the mean pressure was 7.5 pounds/square inch (psi). Assume the population standard deviation is 0.9. If the valve was designed to produce a mean pressure of 7.7 psi, is there sufficient evidence at the 0.05 level that the valve does not perform to the specifications? Step 1 of 6 : State the null and alternative hypotheses. Answer Tables Keypad Keyboard Shortcuts Ho: Ha Submit