19. Refer to the prediction equation = 4 58.71P-54P-08G for the no interaction model in Example 12.5.

a) Using it. find the estimated means for each of the six cells, and show that they satisfy a lack of interaction.

b) Using results for this model, construct and interpret 95% Bonferroni confidence inter- vals comparing pairs of party IDs Compare results to those in Table 12.3 for the one-way ANOVA. Which pairs are significantly different?