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 5.1 pounds/square inch. The valve was tested on 160 engines and the mean pressure was 5.2 pounds/square inch. Assume the standard deviation is known to be 0.8. Is there evidence at the 0.02 level that the valve performs above the specifications?

Step 1 of 5: Enter the hypotheses:

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 H0 if z> ???

Step 5 of 5: Enter the conclusion. Reject Null Hypothesis or Fail to Reject Null Hypothesis

Answer 1