A quasi-experimental design does not randomly assign participants to conditions because such assignment is either impossible or unethical.

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Quasi-experimental designs typically use pre-existing groups or naturally occurring conditions which cannot be randomly assigned. Random assignment is not always possible or ethical, especially in real-world settings where participants cannot be manipulated or forced into certain conditions. Quasi-experimental designs aim to eliminate as many threats to internal validity as possible by carefully matching groups or controlling for confounding variables.

A Quasi-Experimental Design Does Not Randomly Assign Participants to Conditions