Consider the model y = ?0 + ?1x + ?2d + ?, where x is a quantitative variable and d is a dummy variable. When d = 1, the predicted value of y ________.
A. 
= b0 + b1x + b2x
B. 
= (b0 + b2) + b1x
C. 
= (b0 + b1)x + b2
D. 
= b0 + b1x
Answer: B
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