Which of the following equations is appropriate for a linear regression with three predictor variables?
A. Y ? = bX + a
B. Y ? = b1X1 + b2X2 + a
C. Y ? = b1X1 + b2X2 + b3X3 + a
D. Y ? = b1X1 + b2X2 + b3X3 + b4X4
Ans: C
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