Suppose you are the manager of Speedy Change which daims that it will change the customerscars in less than 30 minutes on average. Further suppose that several complaints have been filed trom customers stating that their oil change took longer than 30 minutes. Upper-level management at Speedy Change headquarters has requested that you investigate the complaints To begin your investigation, you randomly audit 36 oil changes performed by Speedy Change and record the time each customer waited for the oil change. The number of minutes to complete each of the 36 oil changes is reported below