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11.2 Understanding the Fitted Regression Line. The fitted regression equation for a multiple regression is ŷ...

11.2 Understanding the Fitted Regression Line. The fitted regression equation for a multiple regression is

ŷ = - 10.8 + 3.2*x1 + 2.8*x2

  1. If x1 = 4 and x2 = 2, what is the predicted value of y?
  2. For the answer to part (a) to be valid, is it necessary that the values x1 = 4 and x2 = 2 correspond to a case in the data set? Explain why or why not?
  3. If you hold x1 at a fixed value, what is the effect of an increase of three units of x2 on the predicted value of y?
Math   Statistics-And-Probability   
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