An engineer designed a valve that will regulate water pressure on an automobile
ID: 2948619 • Letter: A
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 5.4 pounds/square inch. It is believed that the valve performs above the specifications. The valve was tested on 24 engines and the mean pressure was 5.7 pounds/square inch with a standard deviation of 1.0. A level of significance of 0.05 will be used. Assume the population distribution is approximately normal. Determine the decision rule for rejecting the null hypothesis. Round your answer to three decimal places.
Reject H0 if t > (BLANK)
Explanation / Answer
Degrees of freedom df = n -1 = 24 - 1 = 23
t critical value at 0.05 level for 23 df = 2.069
Decision rule=
Reject H0 if t > 1.714