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 5.8 pounds/square inch. The valve was tested on 150 engines and the mean pressure was 5.7 pounds/square inch. Assume the standard deviation is known to be 0.8. Is there evidence at the 0.02 level that the valve does not perform to the specifications?

Step 1 of 5:

Enter the hypotheses:

HO

HA

Step 2 of 5:

Enter the value of the z test 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.

Answer 1