An engineer 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 4.8 pounds/square inch. The valve was tested on 100 engines and the mean pressure was 5.0 pounds/square inch. Assume the variance is known to be 1.00. Is there evidence at the 0.02 level that the valve performs above the specifications?

Step 2 of 5 : Enter the value of the z test statistic. Round your answer to two decimal places.