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

question 67

Multiple Choice

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.

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

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