Suppose you compute the least-squares regression line for a set of data and find that the slope is 91.2. You then remove a point from the data, recompute the least-squares regression line, and find that the new slope is 13.7. What should the removed point be considered?

Question

Quizplus · Accepted Answer

The fact that the removal of the point caused a drastic change in the slope of the regression line suggests that it was an influential point. An influential point is one whose inclusion or exclusion greatly affects the regression model.

Suppose You Compute the Least-Squares Regression Line for a Set