Formula The residual is the difference of the Actual Value, compared to what a Regression Line predicts.

Finding Residuals w/ classpad

Copy Residual to list 3 to end up w/ the residual for each value in the list 3 next to it

Residual Plot §

A Residual plot is made by plotting the value of the residual, e.g. #adccffa6;">Observed = 15,5 #d2b3ffa6;">Predicted = 15,4

Plot 1 onto the y axis, keep it on the same x axis as it was.

Plotted Residual = 15,1

15,1 plotted on Regression Plot

Finished Regression Plot

(In this examle the linear model is not appropriate as a pattern is evident on the Regression Plot)

Plotting Residual Plot w/ classpad

Determining If Linear Model is appropriate §

A Pattern that is easily visible means that the linear model is not appropriate.