Sample Question 1. Given the regression model y = 30 + B1x1 + 32x2 + 83x12 + B4x22 + e, if we wish to test the significance of higher-order terms (x12 - x1 * x2 and x22 = x2 * x2), which test would we use? A) overall F test B) Durbin-Watson test C) partial F test D) t test E) Cook's distance measure