In the past, the mean running time for a certain type of battery has been 10 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.(10 Points)

H (0): = 10 hours and H(a): 10 hours

H (0): 10 hours and H(a): = 10 hours

H (0): = 10 hours and H(a): > 10 hour