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 $220 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.

H0:	- Select your answer -=Item 1
Ha:	- Select your answer -=>

(b)

Comment on the conclusion when H₀ cannot be rejected.

When H₀ cannot be rejected, there - Select your answer -is notisItem 5 enough evidence to conclude that the proposed manufacturing method - Select your answer -changesdoes not changereducesincreasesItem 6 costs.

(c)

Comment on the conclusion when H₀ can be rejected.

When H₀ can be rejected, there - Select your answer -is notisItem 7 enough evidence to conclude that the proposed manufacturing method - Select your answer -changesdoes not changereducesincreasesItem 8 costs.