A university administrator was interested in determining students' views on the increase in the cost of parking on campus. The administrator believed student's residence ( in-state or out-of-state) may have an effect on their opinion. Ten percent of the student body at the university has their primary residence out-of-state. The administrator was interested in surveying 200 students at the university and randomly selected 20 out-of-state students and 180 in-state students from their list of all students. The sampling frame is .