Generalizability of results

First-year students at a certain large university are required to live on campus in $1$1 of the $24$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$12 of these residence halls. Her department surveyed a large simple random sample of first-year students who live in those $12$12 residence halls about their overall satisfaction with campus living.