Question: For the multiple regression equation ybar = 100 + 20x1 – 3x2 + 120x3:

a) Identify the y-intercept and partial regression coefficients.

b) If x1 = 12, x2 = 5, and x3 = 10, what is the estimated value of y?

c) If x3 were to increase by 4, what change would be necessary in x2 in order for the estimated value of y to remain unchanged?