Section 3.3 Regression Wisdom AP Statistics Section 3.3 Regression Wisdom

Objective: To be able to understand the regression process. Final Points: Correlation and regression should only be used for linear relationships. Both are nonresistant. Watch out for outliers and influential points. Influential points are points that if removed from the data set would markedly change the slope, the correlation or the regression equation. They tend to be outliers in the x-direction. Beware of lurking variables. Watch for correlation based on averaged data.

Correlation ignores the explanatory/response variable relationship. The LSRL requires an explanatory/response variable relationship. Every LSRL passes through ( 𝑥 , 𝑦 ).