A change is made that should improve customer satisfaction with respect to speed of service. The null hypothesis, that there is an improvement, is tested versus the alternative, that there is no change. Is this a correct statement?

(Choose the best answer and explanation)

Group of answer choices

Yes. The null hypothesis is the one the investigator wants to find evidence in support of.

Yes. "No change" is the alternative because "no change" means "look for another alternative."

No. The null hypothesis must be that there is a change in either direction, not just an improvement.

No. The null hypothesis should be that there is no change.