A researcher wants to know if the association between phone usage and price per minute varies by gender. Which is the simplest regression that can help answer this question?
A. Phone Usage = B0 + B1*female + E
B. Phone Usage = B0 + B1*price+ E
C. Phone Usage = B0 + B1female + B2price + E
D. Phone Usage = B0 + B1female + B2price + B3pricefemale + E
Answer: Phone Usage = B0 + B1female + B2price + B3pricefemale + E