=+5. Determine whether the continuous variable is statistically significant across groups

(without the cross-product term in the equation). You can do this in two ways. You can regress the outcome on the categorical variable and then add the continuous variable to the regression equation, focusing on and the associated test of statistical significance. Alternatively, you can focus on the statistical significance of the b associated with the continuous variable with the categorical variable in the equation (in the present example, the b associated with CBM in the top of the table of coefficients in Figure 14). If the continuous variable is statistically significant, meaning that the test is a valid predictor of the outcome across groups, go to step 6. If not, meaning a lack of predictive validity across groups, go to step 7.