The data mtcars comprises 10 aspects of automobile design and performance for 32 automobiles (1973–74 models). Source: the 1974 Motor Trend US magazine.

We will study 1. mpg Miles/(US) gallon 2. wt Weight (1000 lbs) 3. hp Gross horsepower (by size) 4. am Transmission (0 = automatic, 1 = manual) (by color)