1.An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on190

190engines and the mean pressure was6.4

6.4pounds/square inch (psi). Assume the population variance is0.64

0.64. If the valve was designed to produce a mean pressure of6.3

6.3psi, is there sufficient evidence at the0.1

0.1level that the valve does not perform to the specifications?

Answer

A. There is not sufficient evidence to support the claim that the valve does not perform to the specifications.

B.There is sufficient evidence to support the claim that the valve does not perform to the specifications.