7.31 Outliers, Part I. Identify the outliers in the scatterplots shown below, and determine what type of outliers they are. Explain your reasoning.

  1. There is one point to the far right of all the other points. The least squares line diverges strongly from the cluster of dots indicating that the outlier has strongly affected the line, which makes it an influential point.

  2. The outlier is far to the bottom right of the center of dots, indicating it is a point with high leverage. However, it falls on the least squares line and does not appear to be very influential.

  3. The outlier is far from the dots but not horizontally far; it is vertically above the cluster. Therefore, the point does not have high leverage and therefore, does not appear to influence the line much.