Question

An engineer has designed a valve that will regulate water pressure on an automobile engine. The engineer designed the valve such that it would produce a mean pressure of 6.4 pounds/square inch. The valve was tested on 24 engines and the mean pressure was 6.1 pounds/square inch with a standard deviation of 1.0. Is there evidence at the 0.01 level that the valve performs below the specifications? Assume the population distribution is approximately normal.

Step 4 of 5: Determine the decision rule for rejecting the null hypothesis. Round your answer to three decimal places.

Answer 1