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 5.5 pounds/square inch. It is believed that the valve performs above the specifications. The valve was tested on 2626 engines and the mean pressure was 5.6 pounds/square inch with a variance of 0.36. A level of significance of 0.1 will be used. Assume the population distribution is approximately normal. What is the null hypothesis for the decision?

A. H0: µ ≤ 5.6

• B. H0: µ ≥ 0.36

• C. H0: µ ≥ 5.6

• D. H0: µ = 5.6

• E. H0: µ ≤ 5.5

Answer 1