To run a linear regression analysis, from the menus choose:

Analyze
Regression
Linear...

Select time as the dependent variable.

Select diam as the independent variable.

Select type as the case labeling variable.

Click Plots.

Select *SDRESID as the y variable and *ZPRED as the x variable.

Select Histogram and Normal probability plot.

Click Continue.

Click Save in the Linear Regression dialog box.

Select Standardized in the Predicted Values group.

Select Cook's and Leverage values in the Distances group.

Click Continue.

Click OK in the Linear Regression dialog box.

These selections produce a linear regression model for polishing time based on diameter. Diagnostic plots of the Studentized residuals by the model-predicted values are requested, and various values are saved for further diagnostic testing.