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 7.0 pounds/square inch. It is believed that the valve performs above the specifications. The valve was tested on 210 engines and the mean pressure was 7.1 pounds/square inch. Assume the standard deviation is known to be 0.8 A level of significance of 0.02 will be used. Find the value of the test statistic. Round your answer to 2 decimal places.