In the Past,the Mean Battery Life for a Certain Type

question 12

Multiple Choice

In the past,the mean battery life for a certain type of flashlight battery has been 9.5 hours.The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean battery life has increased as a result.The hypotheses are:
: μ = 9.5 hours
: μ > 9.5 hours
Explain the result of a Type II error.

• A)The manufacturer will not decide the mean battery life is greater than 9.5 hours when in fact it is greater than 9.5 hours.
• B)The manufacturer will decide the mean battery life is greater than 9.5 hours when in fact it is 9.5 hours.
• C)The manufacturer will decide the mean battery life is greater than 9.5 hours when in fact it is greater than 9.5 hours.
• D)The manufacturer will decide the mean battery life is 9.6 hours lower than it was prior to the change in the production method.
• E)The manufacturer will decide the mean battery life is 8.1 hours greater than it was prior to the change in the production method.

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Definitions:

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