EXAMPLE 15.14 ANOVA Software Output

CASE 15.1 Figure 15.8 gives the two-way ANOVA output from Minitab, Excel, SPSS, and SAS. Look first at the ANOVA table in the Minitab output. The form of the table is very similar to the general form of the two-way ANOVA table given on page 15-14. In place of A and B as the generic factors, the output gives the labels that we specified when we entered the data. We have main effects for “Discount” and “Promo.” The interaction between these two factors is labeled “Promo*Discount,” and the last two rows are “Error” and “Total.” The results of the significance tests are in the last two columns, labeled “-Value” and “-Value.” As expected, the interaction is not statistically significant and . On the other hand, the main effects of discount and and promotion and are significant.