Student Solutions Manual Applied Statistics and Probability for Engineers, Fifth Edition

CHAPTER 12

Sections 12-1

c)    = 171.055+3.714(18)−1.126(43) = 189.49

12-3.    a)

The interaction term in model 2 affects the slope of the regression equation. That is, it modifies the amount of change per unit of x₁ on .

b)   x₂ = 5                     = 100 + 2x₁ + 4(5)

        = 120 + 2x₁

Then, 2 is the expected change on per unit of x₁.

NO, it does not depend on the value of x₂, because there is no relationship or interaction between these two variables in model 1.

Yes, result does depend on the value of x₂, because x₂ interacts with x₁.

12-5.   a)  The results from Minitab follow. The model can be expressed as

Satisfaction = 144 - 1.11 Age - 0.585 Severity + 1.30 Anxiety

c)    from ...