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An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 260 engines and the mean pressure was 5.3 pounds/square inch (psi). Assume the population standard deviation is 0.9. If the valve was designed to produce a mean pressure of 5.4 psi, is there sufficient evidence at the 0.01 level that the valve performs below the specifications? Step 6 of 6: Make the decision to reject or fail to reject the null hypothesis. Answer 2 Points Tables Keypad Keyboard Shortcuts O Reject Null Hypothesis O Fail to Reject Null Hypothesis