Because of high production-changeover time and costs, a director of manufacturing must convince management that a proposed manufacturing method...

Because of high production-changeover time and costs, a director of manufacturing must convince management that a proposed manufacturing method reduces costs before the new method can be implemented. The current production method operates with a mean cost of $230 per hour. A research study will measure the cost of the new method over a sample production period.

a. Develop the null and alternative hypotheses most appropriate for this study.

Ho: ____ 230

Ha: ____ 230