EXAMPLE 2.15
Rating versus price and type of laundry detergent. In our scatterplot, we use the color blue for liquids and the color red for powders. The scatterplot is given in Figure 2.9. Separate lines are given for each type of laundry detergent. Most of the laundry detergents are liquids. There are three powders with somewhat low prices and four powders with relatively high prices. The prices of the powders are similar to the prices of the liquids.
Figure 2.9 Scatterplot of rating versus price per load (in cents), with fitted straight lines, for 52 laundry detergents, Example 2.15. The type of detergent is indicated by the color: blue for liquid and red for powder.