Question: In the past, the mean running time for a certain type of flashlight battery has been 8.9hours. The manufacturer has introduced a change in the

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

8.9hours.

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 increased as a result. The hypotheses are:H0:=8.9hoursHa:>8.9hourswhere

is the mean running time of the new batteriesExplain the meaning of a Type II error.

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