Business Statistics

Chapter 15 | Multiple Regression Analysis 525

FIGURE 15.29

Calculation of Advertisement

Sq quantities (square of

advertisment observations)

using Minitab

FIGURE 15.28

Minitab Calculator dialog box

15.9.2 Using Minitab for the Quadratic Regression Model

In order to create a new variable in a quadratic regression model, first select Calc from the menu bar

and then select Calculator. The Calculator dialog box will appear on the screen (Figure 15.28). In

the Store result in variable box, place the name of the new variable as Advertisement Sq. In the

Expression box, place ‘Advertisement’ **2 (as shown in Figure 15.28). Click OK, the new variable