To find out if the mean salaries of the teachers in the North and South are statistically different from that of the teachers in the West (the comparison category), we have to find out if the slope coefficients of the regression result are statistically significant. For this, we need to consider the "p" values. The estimated slope coefficient for the North is not statistically significant as its "p" value is 23 percent; however, that of the South is statistically significant at the 5% level as its "p" value is only around 3.5 percent. Thus the overall result is that the mean salaries of the teachers in the West and North are not statistically different from each other, but the mean salary of the teachers in the South is statistically lower than that in the West by around $3265. The model is diagrammatically shown in Figure 2. This model is an ANOVA model with one qualitative variable having 3 categories.