In the past, the mean running time for a certain type of flashlight 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 decreased as a result. A hypothesis test is to be performed. Determine the null and alternative hypotheses.    A.  H0: µ ¥ 9.6 hours and H1: µ = 9.6 hours  B.  H0: µ = 9.6 hours and H1: µ ¥ 9.6 hours  C.  H0: µ = 9.6 hours and H1: µ > 9.6 hours  D.  H0: µ = 9.6 hours and H1: µ < 9.6 hours

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