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In the past, the mean running time for a certain type of flashlight battery has beenThe manufacturer has introduced a change in the production method

In the past, the mean running time for a certain type of flashlight battery has beenThe manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time differs from 8.8.

A.) Left-tailed

B.) Two-tailed

C.) Right-tailed

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