(d) Is the interaction term Region*PotUnemployment significant in model (1)? State your hypothesis, test statistics and its value, p-value, and draw your conclusion based on the SAS output (e) Based on (c) and (d), do you think the lines between Y and PctUnem- ployment are coincident, parallel, or not, for the 4 geographic regions? (f ) If you are interested in comparing the means of Y in the 4 geographic regions, based on your result in (d), can we use ANCOVA to compare the means while controlling for PotUmemployment? Explain why