An outlier for a scatter plot is the point or points that are farthest from the regression line. There is at least one outlier on a scatter plot in most cases, and there is usually only one outlier.
If there is a regression line on a scatter plot, we can identify outliers.
- If one point of a scatter plot is farther from the regression line than some other point, then the scatter plot has at least one outlier.
- If a number of points are the same farthest distance from the regression line, then all these points are outliers.
- If all points of the scatter plot are the same distance from the regression line, then there is no outlier.
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