STATS 110 Final: Statistics 110 Final Exam Solutions
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Point b: residual near zero & large leverage. Solution: points a and b should be on or near the line but removed from the other points in either direction. Point c should be far above or below the line, but in the mid-range of the length variable. b. Solution: yes, points a and b are illustrating the same thing. Residual near zero mean it is not an outlier, and large leverage means it is influential. e m. Solution: adjusted r2 adjusts for the number of predictors in a model. R2 will always increase when a new variable is added but adjusted r2 will not, and could go down. It reflects the trade-off between reducing sse and decreasing the denominator of mse, which could make mse go up: explain briefly what the variance inflation factor (vif) tells us about a multiple regression model coefficient.
