An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 160160 engines and the mean pressure was 6.16.1pounds/square inches (psi). Assume the population standard deviation is 0.60.6. If the valve was designed to produce a mean pressure of 6.06.0 psi, is there sufficient evidence at the 0.050.05 level that the valve does not perform to the specifications?

Step 1 of 6:

State the null and alternative hypotheses.

Step 3 of 6:

Specify if the test is one-tailed or two-tailed.

Step 5 of 6:

Identify the level of significance for the hypothesis test.