Use the regression equation found in Exercise 25.

(a) x₁ = 10, x₂ = 0.7

(b) x₁ = 15, x₂ = 1.1

(c) x₁ = 13, x₂ = 0.8

(d) x₁ = 9, x₂ = 0.8

Use the multiple regression equation to predict the y-values for the values of the independent variables.

Exercise 25

The table shows the carbon monoxide, tar, and nicotine content, all in milligrams, of 14 brands of U.S. cigarettes.

Carbon monoxide, y 15 17 Tar, xNicotine, x2 16 16 10 12 14 16 14 16 10 18 17 13 14 16 16 10 19 17 12 1.0 0.8 0.9 0.8 0.8 1.2 1.2 0.8 1.2 1.0 10 14 15 1.2