In the past, the mean running time for a certain type of radio battery has been 9.6 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. H0: µ > 9.6 hours Ha: µ > 9.6 hours
B. H0: µ = 9.6 hours Ha: µ > 9.6 hours
C. H0: µ ≠ 9.6 hours Ha: µ = 9.6 hours
D. H0: µ = 9.6 hours Ha: µ ≠ 9.6 hours
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