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 of5.2 pounds/square inch. The valve was tested on130engines and the mean pressure was5.0pounds/square inch. Assume the standard deviation is known to be0.9. Is there evidence at the0.02level that the valve performs below the specifications?

Step 1 of 5:Enter the hypotheses:

Ho:

Ha:

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

Step 3 of 5:Specify if the test is one-tailed or two-tailed.

Step 4 of 5:Enter the decision rule.

Reject Ho if z< ?

Step 5 of 5:Enter the conclusion.