Education researchers are interested in the workload expectations of freshmen at a local university. Since all of the freshmen are randomly placed into freshman seminar classes, the researchers randomly select 3 freshman seminar classes and survey all of the students within those classes. Which sampling method was used?

The researchers randomly select entire seminar classes, then survey every student in each selected class. Selecting groups at random and including all members of those groups is cluster sampling. Simple random sampling would select individual freshmen directly rather than whole classes.

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