Let y wear life of a bearing, x1 oil viscosity, and x2 load. Suppose
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 .0950x2 .0090x1x2 !
a. What is the mean value of life when viscosity is 40 and load is 1100?
b. When viscosity is 30, what is the change in mean life associated with an increase of 1 in load? When viscosity is 40, what is the change in mean life associated with an increase of 1 in load?
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Related Book For 
Probability And Statistics For Engineering And The Sciences
ISBN: 9781111802325
7th Edition
Authors: Dave Ellis, Jay L Devore
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