A particular article used a multiple regression model with t

A particular article used a multiple regression model with the following four independent variables.

The model equation suggested in the article is given below.

(a) Assume that this is the correct equation. What is the mean value of y when x₁ = 30, x₂ = 0.6, x₃ = 50 and x₄ = 100?


(b) What mean error percentage is associated with a backlight level of 40, character subtense of 0.6, viewing angle of 10, and ambient light level of 30?

Solution