Exhibit 15-4 a. y = 0 + 1x1 + 2x2 + b. E(y) = 0 + 1x1 c. = b0 + b1 x1 + b2 x2 d. E(y) = 0 + 1x1 + 2x2 Refer to Exhibit 15-4. Which equation gives the estimated regression line? Question 5 options: equation a equation b equation c equation d