The Myrtle Beach International Airport provides a cell phone parking lot where people can wait for a message to pick up arriving passengers. To decide if the cell phone lot has enough parking places, the manager of airport parking needs to know if the mean time in the lot is more than 15 minutes. A sample of 12 recent customers showed they were in the lot the following lengths of time, in minutes. 30 24 28 22 14 2 2 39 23 23 28 12 31 At the .05 significance level, is it reasonable to conclude that the mean time in the lot is more than 15 minutes?