Which of the following research designs compares preexisting groups, tends to have high external validity, and is the only design available for topics for which random assignment to groups would be impossible?

Question

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Quasi-experimental designs compare preexisting groups, often cannot use random assignment due to practical or ethical reasons, and tend to have higher external validity than strictly controlled experimental designs. This makes them suitable for research topics where random assignment is not feasible.

Which of the Following Research Designs Compares Preexisting Groups, Tends