In some fi refi ghting organizations, you must serve as a fi refi ghter for some period of time before you can become part of the emergency medical service arm of the organization. Does that mean EMS workers are older, on average, than traditional fi refi ghters? Use the data shown and  0.05 to test whether EMS workers are signifi cantly older than fi refi ghters. Assume the two groups are independent and you do not want to use a t test to analyse the data. Firefi ghters EMS Workers Firefi ghters EMS Workers 23 27 32 39 37 29 24 33 28 30 21 30 EMS Workers Firefi ghters EMS Workers 25 33 27 28 41 28 27 36 36 30