2. We are interested in studying whether attending a selective enrollment school increases students' college attendance rate. To determine entrance eligibility, the school runs an entrance exam, all applicants whose score is above the 90th percentile of all applicants are offered a seat and attend the school, all other applicants are rejected. a. Propose a regression discontinuity (RD) design to study the effect of attending the school on students' college attendance rate. In particular, specify the outcome variable, the treatment variable, the running variable, and the group of students that you will use for the analysis.

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A: The solution is given in the next step.

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A: