Chapter 8, Problem 31E

Unusual points Each of these four scatterplots shows a cluster of points and one “stray” point. For each, answer these questions:

1. 1) In what way is the point unusual? Does it have high leverage, a large residual, or both?
2. 2) Do you think that point is an influential point?
3. 3) If that point were removed, would the correlation become stronger or weaker? Explain.
4. 4) If that point were removed, would the slope of the regression line increase or decrease? Explain.