EXAMPLE 2.10
Scatterplot with a straight line. Figure 2.3 plots the laundry detergent data with a straight line. The line helps us to see and to evaluate the linear form of the relationship. In Section 2.4 (page 107), we will learn how to determine this line.
Figure 2.3 Scatterplot of rating versus price per load (in cents), with a fitted straight line, Example 2.10.
There is a large amount of scatter about the line. We see that there are eight laundry detergents with a price of 14 cents per load. For these products, the variation in ratings is substantial, from 25 to 71. We do not see any additional outliers in this plot.