Let y = wear life of a bearing, x1 = oil viscosity, and X2 = load. Suppose that
ID: 3063517 • Letter: L
Question
Let y = wear life of a bearing, x1 = oil viscosity, and X2 = load. Suppose that the multiple regression model relating life to viscosity and load is Y = 125.0 + 7.75X1 + 0.0950x2-0.0090X1X2 + (a) What is the mean value of life when viscosity is 38 and load is 1120? 142.86 b) When viscosity is 34, what is the change in mean life associated with an increase of 1 in load? (Enter your answer to three decimal places.) 211 When viscosity is 38, what is the change in mean life associated with an increase of 1 in load? (Enter your answer to three decimal places.) 247Explanation / Answer
(B)
When the viscosity is 34, the equation becomes
Y = 125 + 7.75*34 + 0.0950X2 -0.0090*34X2 + error
Y = 388.5 -0.211* X2 + error
Your answer is right, I guess writing the negative value (-0.211) can give the right answer instead of positive value.
(c)
When the viscosity is 38, the equation becomes
Y = 125 + 7.75*38 + 0.0950X2 -0.0090*38X2 + error
Y = 419.5 -0.247* X2 + error
Here also write -0.247 instead of 0.247
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.