Describing the Relation Between Two Variables

Scatter Diagrams; Linear Correlation
    Drawing a Scatter Diagram
    Computing and Interpreting the Correlation Coefficient

Least-squares Regression
    Finding an Equation that Describes Linearly Related Data
    Finding the Least-Squares Regression Line
    Comparing the Sum of Squared Residuals

Diagnostics on the Least-squares Regression Line
    Computing the Coefficient of Determination, R2
    Is a Linear Model Appropriate?
    Constant Error Variance
    Identifying Outliers
    Graphical Residual Analysis
    Identifying Influential Observations