If a researcher is unable to randomly assign subjects to groups and must use a comparison group, the study design is considered nonexperimental.

Name: If a researcher is unable to randomly assign subjects to groups and must use a comparison group, the study design is considered nonexperimental.
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A study that uses a comparison group without random assignment is considered a quasi-experimental design, not nonexperimental. Nonexperimental designs do not involve manipulation or comparison groups.

If a Researcher Is Unable to Randomly Assign Subjects to Groups