Generalizability of results

First-year students at a certain large university are required to live on campus in $1$‍ of the $24$‍ available residence halls. After their first year, students have the option to live away from campus, but many choose to continue living in the residence halls. Estella oversees $12$‍ of these residence halls. Her department surveyed a large simple random sample of first-year students who live in those $12$‍ residence halls about their overall satisfaction with campus living.