Paid 4:0 1034 Answer: Question 29: A Professor then runs a new regression where he controls for students' backgrounds as follows Score = bo + bj Paid + b2 BusinessDummy + b;EconomicsDummy, where Business Dummy is a dummy variable indicating if the student's academic background was Business, and EconomicsDummy is a dummy variable indicating if the student's academic background was Economics. Why does he not include a dummy variable for Psychology