In the past,the mean running time for a certain type of flashlight battery has been $\text { hours. }$ 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.

A) Two-sided
B) Upper-tailed
C) Lower-tailed

Question

In the past,the mean running time for a certain type of flashlight battery has been

\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.

A) Two-sided
B) Upper-tailed
C) Lower-tailed

Lainelle Albeza · Accepted Answer

Final Answer : A, Explanation :  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.

Definitions

Learning Objectives

Learning Objectives

Related questions