What is the population?

Question

Results are based on telephone interviews conducted February 29th- March 15, 2016, with a random sample of 3,072 U.S college students, aged 18-24, who are currently enrolled full time and four-year institutions. The college sample consists of a random subset of full-time students at 32 randomly selected U.S four-year colleges that were stratified based on region, enrollment size and private versus public control. For results based on the total sample of college students, the margin of sampling error is +3 or -3 percent points at the 95% confidence level.

Answer 1

I would assume that the population is US college students 18-24 who are currently enrolled full time four year institutions.