For the fleet described in Exercise 2.48,
a. Construct a simple tabulation in which the counts are according to the type of trans mission.
b. Construct a cross-tabulation describing the fleet, using type of transmission and whether the vehicle has air conditioning as the categorization variables.
c. Construct a display showing the average mpg according to type of transmission and whether the vehicle has air conditioning. Do the categorization variables seem to be related to mpg? If so, how?

Exercise 2.48

Engine Trans AC mpg Engine Trans AC mpg 1 1 1 36.4 1 1 2 38.6 1 1 1 37.7 1 1 34.8 38.2 41.8 1 1 1 1 2 2 30.8 1 1 1 1 2 2 26.4 1 1 1 34.8 1 2 2 31.6 1 2 1 35.4 1 2 2 28.3 1 2 1 31.3 1 2 2 29.5 1 2 1 32.2 2 1 2 23.0 1 1 26.2 1 2 21.5 2 1 1 25.5 1 2 19.5 2 1 1 27.7 2 2 18.3 2 2 1 22.0 2 2 19.1 2 2 23.3 2 2 20.8 1 1 2 34.8 2 21.8 1 2 34.0 2 2 18.4 INNNNNN2