The U.S. Department of Energy€™s Fuel Economy Guide provides fuel efficiency data for cars and trucks (Fuel Economy website, February 22, 2008). A portion of the data for 311 compact, midsize, and large cars is shown in Table 2.14. The data set contains the following variables:

Size: Compact, Midsize, and Large
Displacement: Engine size in liters
Cylinders: Number of cylinders in the engine
Drive: Front wheel (F), rear wheel (R), and four wheel (4)
Fuel Type: Premium (P) or regular (R) fuel
City MPG: Fuel efficiency rating for city driving in terms of miles per gallon
Hwy MPG: Fuel efficiency rating for highway driving in terms of miles per gallon
The complete data set is contained in the file named FuelData08.
a. Prepare a crosstabulation of the data on Size (rows) and Hwy MPG (columns). Use classes of 15€“19, 20€“24, 25€“29, 30€“34, and 35€“39 for Hwy MPG.
b. Comment on the relationship between Size and Hwy MPG.
c. Prepare a crosstabulation of the data on Drive (rows) and City MPG (columns). Use classes of 5-9, 10-14, 15-19, 20-24, 25-29, 30-34, and 35-39 for City MPG.
d. Comment on the relationship between Drive and City MPG.
e. Prepare a crosstabulation of the data on Fuel Type (rows) and City MPG (columns).
Use classes of 5-9, 10-14, 15-19, 20-24, 25-29, 30-34, and 35-39 for City MPG.
f. Comment on the relationship between Fuel Type and City MPG.

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Car Size Displacement Cylinders Drive Fuel Type City MPG Hwy MPG 1 Compact 2 Compact 3 Compact 3.1 15 17 17 25 25 161 Midsize 162 Midsize 2.4 19 29 310 Large 31 Large 3.0 17 18 6 25