1. Scatterplot of Y on X1
2. Scatterplot of Y on X2
3. Scatterplot of X2 on X1
4. Direct effect of X2
5. Indirect effect of X2
6. Scatterplot of Y on ŷ
7. Scatterplot of e on ŷ
8. Normal quantile plot
9. Test H0: β1 = β2 = 0
10. Test H0: β2 = 0
(a) Similar variances
(b) F-statistic
(c) Collinearity
(d) Nearly normal errors
(e) Nonlinear effect
(f) Product of marginal slopes
(g) Partial slope for X2
(h) Leveraged outlier
(i) t-statistic
(j) Calibration plot