An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 170 engines and the mean pressure was 6.4 pounds/square inch (psi). Assume the population standard deviation is 0.9. If the valve was designed to produce a mean pressure of 6.2 psi, is there sufficient evidence at the 0.01 level that the valve performs above the specifications? Step 1 of 6: State the null and alternative hypotheses. Answer 2 Points Ho: Ha Keypad

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