Multiple Choice
In the model Yi = β0 + β1X1 + β2X2 + β3(X1 × X2) + ui,the expected effect 
is
A) β1 + β3X2.
B) β1.
C) β1 + β3.
D) β1 + β3X1.
Correct Answer:
Verified
Correct Answer:
Verified
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