In the past,the mean running time for a certain type of flashlight battery has been $9.0 \text { hours. }$ The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has changed as a result.

Question

Quizplus · Accepted Answer

Since the manufacturer wants to test whether the mean running time has changed, we need to test for a difference in means, which is a two-sided test. We want to check if the mean running time has either decreased or increased as a result of the production method change. Therefore, the best choice for this scenario is a two-sided hypothesis test.

In the Past,the Mean Running Time for a Certain Type 9.0 hours. 9.0 \text { hours. }9.0 hours.

In the Past,the Mean Running Time for a Certain Type $9.0 \text { hours. }$