The U.S. Department of Energy’s Fuel Economy Guide provides fuel efficiency datafor cars and trucks (Fuel Economy website, September, 2012). A portion of the data for149 compact, midsize, and large cars is shown in Table 2.13. The data set contains thefollowing variables:Size: Compact, Midsize, and LargeDisplacement: Engine size in litersCylinders: Number of cylinders in the engineDrive: All wheel (A), front wheel (F), and rear wheel (R)Fuel Type: Premium (P) or regular (R) fuelCity MPG: Fuel efficiency rating for city driving in terms of miles per gallonHwy MPG: Fuel efficiency rating for highway driving in terms of miles per gallonThe complete data set is contained in the file named FuelData2012.a. Prepare a crosstabulation of the data on Size (rows) and Hwy MPG (columns). Useclasses of 15–19, 20–24, 25–29, 30–34, 35–39, and 40–44 for Hwy MPG.b. Comment on the relationship beween Size and Hwy MPG.
The U.S. Department of Energy’s Fuel Economy Guide provides fuel efficiency data
for cars and trucks (Fuel Economy website, September, 2012). A portion of the data for
149 compact, midsize, and large cars is shown in Table 2.13. 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: All wheel (A), front wheel (F), and rear wheel (R)
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 FuelData2012.
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, 35–39, and 40–44 for Hwy MPG.
b. Comment on the relationship beween Size and Hwy MPG.
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