# Explore the Residuals of a Data Set Guidance for Casio ClassPad

Describe the residual data set:

 $a$ $b-f\left(a\right)$ $1$ $2$ $3$ $4$ $5$ $-9$ $-2$ $2$ $4$ $5$

## Step 1

In order to create a table that represents this residual data, click anywhere in ClassPad to bring up the ClassPad menu, and click on the Statistical Data icon.

## Step 2

Enter the data set into the table.

## Step 3

To see the scatter plot, select the data in the table, click Graph in the pop-up menu and then select Scatterplot.

## Step 4

Verify the graph of the residuals.

## Step 5

Add the rest of the points in the table.

 $a$ $b-f\left(a\right)$ 1 2 3 4 5 5 6 6 7 7 8 8 5 9 -9 -2 2 4 5 3 5 2 -5 -2.5 2 5 -4 5

## Step 6

To see the enlarged scatter plot, select the data in the table, click Graph in the pop-up menu and then select Scatterplot. What patterns can you identify in the following residual plots that might indicate that the regression line is not a good model for the data? Based on the residual plot, are there any points that may be considered outliers?