A formula for the multiple regression equation with three predictor variables is
a. Y' = bX + a
b. Y' = b1X1 + b2X2 + b3X3 + b
c. Y' = b1X1 + b2X2 + b3X3 + a
d. Y' = b1X1 + b2X2 + b3X3
e. none of the above
Ans: c
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