1. A company uses a production process designed to make machine component that have an average thickness of 5 inches. The company suspects that the process is not maintaining its intended average.

a. If the company wants to modify its process if the average thickness is smaller than 5 inches, what null hypothesis should it use?

b. If the company wants to modify its process if the average thickness is different from 5 inches, what null hypothesis and alternative hypothesis should it use?