When subjects in studies are randomly assigned to treatment groups, we call this a(n) _____ study, whereas if the subjects are in treatment groups for some other reasons, we call this a(n) _____ study.

Question

Quizplus · Accepted Answer

Random assignment to treatment groups is a hallmark of experimental studies, while studies where subjects are in treatment groups for reasons not controlled by the researcher are observational.

When Subjects in Studies Are Randomly Assigned to Treatment Groups