We are going to discuss further the research we saw in Lecture 8 about the effects of attending FIU university for the marginal student from Zimmerman (2014). Admissions probability FIU attendance 35 FIU admission Attendance Probability -2 - 2 GPA distance GPA distance FIG. 4.-Admissions and FIU attendance. Lines are fitted values based on the main specification. Dots, shown every .05 grade points, are rolling averages of val- ues within .05 grade points on either side that have the same value of the threshold- crossing dummy. 2a. Explain what empirical strategy Zimmerman (2014) uses to examine the effects of attending FIU for the marginal student (remember from class and graph above)