Question

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 6.9 pounds/square inch. It is believed that the valve performs above the specifications. The valve was tested on 200 engines and the mean pressure was 7.1 pounds/square inch. Assume the standard deviation is known to be 1.0. A level of significance of 0.05 will be used. Determine the decision rule.

Enter the decision rule.

Answer 1