An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 1 10 engines and the mean pressure was 7.1 Ibs/square inch. Assume the variance is known to be 0.64. If the valve was designed to produce a mean pressure of 7 Ibs/square inch, is there sufficient evidence at the 0.01 level that the valve does not perform to the specifications? State the null and alternative hypotheses for the above scenario. + X Tables Keypad Keyboard Shortcuts Ho