Explore the Residuals of a Data Set Guidance for Casio ClassPad

Describe the residual data set:

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

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.

$a$	1	2	3	4	5	5	6	6	7	7	8	8	5	9
$b - f (a)$	-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?