Consider the following model: wage =β
1
edu+β
2
female +β
3
male, where wage: hourly wage (measured in \$), edu: years of education, female: a dummy variable equal to 1 when the gender is female and 0 otherwise; male: a dummy variable equal to 1 when the gender is male and 0 otherwise. Hats represent predictions. The estimates of β parameters are: β
1
=1,β
2
=−1,β
1
=1. What is the predicted wage difference of a male and a female with the same education level (i.e., expected male wage minus female wage)? a. −1 b. 1 C. 0 d. 2