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

Exercise 2.48

Transcribed Image Text:

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