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Classify the hypothesis test as two-tailed, left-tailed, or right-tailed. In the past, the mean running time for a certain type of flashlight battery has beenThe

Classify the hypothesis test as two-tailed, left-tailed, or right-tailed.

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 has changed as a result.

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