Select the statement that is false: Group of answer choices A categorical variable can be added to a scatter plot by using a different color or symbol for each category. A scatter plot is a useful graphical tool for displaying the strength of the relationship between two quantitative variables. The only relationship that a scatter plot can usefully display is linear with no outliers. An individual value that deviates from the overall pattern displayed on a scatter plot is called an outlier. If above-average values of two quantitative variables and below-average values of the same two quantitative variables tend to occur together, the two variables are positively associated.