AP Statistics: Calculating the Equation of the LSRL, Residual Plots

Least Squares Regression Line

The line that makes the sum of the squared residuals as small as possible

To find LSRL by hand

Find slope r(Sy/Sx) or y2-y1 x2-x1

To calculate LSRL

stat, calc, linreg (4), y= will appear at the top

Residual Plots

Scatterplot of the residuals against the explanatory variable.

Residual plots help

Assess how well a regression line fits the data.

Pattern in residual plot

Indicates that a linear model isn't appropriate and when there is no pattern it would be appropriate

How to make a residual plot on the calculator

Put x and y in L1 and L2