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An example of a quasi-experimental study lacking random assignment involves evaluating an anti-bullying program across two similar schools. A researcher implements the program in one school (the treatment group) and compares the bullying incidents to the other school (the control group). Although this design uses a comparison group, the inability to randomly assign individual students to the schools means there may be a selection effect; preexisting differences between the students in the two schools could alternatively explain any observed differences in bullying.

Example of a Quasi-Experimental Study: Anti-Bullying Program

When a researcher evaluates an anti-bullying program by implementing it in one school and comparing the results to a second similar school, what major limitation makes this a quasi-experimental study?

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