A car dealership would like to test the hypothesis that a difference exists in the city gas mileage (miles per gallon when driven in the city) of three cars, Acura TLX, BMW 7 Series and Mercedes-Benz A220. The following data represent the miles per gallon for a random sample of Acura TLX, BMW 7 Series and Mercedes-Benz A220 cars.

Acura TLX	BMW7 Series	Mercedes-Benz A220
22	21	21
24	23	20
21	20	23
21	19	21
22	21	22
24	20	21

If appropriate, perform a multiple comparisons test to determine which pairs of cars have average city miles per gallon that are different using = 0.05.