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

4.1pounds/square inch. It is believed that the valve performs above the specifications. The valve was tested on

200 engines and the mean pressure was

4.2 pounds/square inch. Assume the variance is known to be

0.36. A level of significance of

0.02 will be used. Find the value of the test statistic. Round your answer to 2 decimal places.

Enter the value of the test statistic.