2.50 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?

( DATA SET ) Note: Exercises 2.51–2.54 require a computer and statistical software.