Based on the provided example of the anti-bullying study, diagnose why the difference in student behavior policies between the schools makes it difficult to draw a causal conclusion about the anti-bullying program. In your explanation, describe how this scenario illustrates a selection effect.
Case context: A researcher is conducting a study to evaluate an anti-bullying program. They find two demographically similar schools: School A and School B. The program is implemented in School A (treatment group), while School B receives no program (control group). After one year, bullying incidents are significantly lower in School A. However, the researcher discovers that School A has a much stricter student behavior policy that was enacted right before the study began.
Question: Based on the provided example of the anti-bullying study, diagnose why the difference in student behavior policies between the schools makes it difficult to draw a causal conclusion about the anti-bullying program. In your explanation, describe how this scenario illustrates a selection effect.
Sample answer: The difference in behavior policies illustrates a selection effect because the students were not randomly assigned to the two schools. The preexisting differences in the schools' disciplinary policies, rather than the anti-bullying program itself, could explain the lower bullying incidents in School A. This alternative explanation makes it impossible to establish a clear causal link.
Key points:
- Connects the lack of random assignment to the existence of preexisting differences between the schools.
- Identifies the behavior policy difference as a selection effect.
- Explains that this selection effect serves as an alternative explanation that prevents drawing a causal conclusion about the anti-bullying program.
Rubric: The answer should explain that the lack of random assignment allows for preexisting differences (in this case, the student behavior policy) to exist between the schools. It should identify this as a selection effect and explain that it acts as an alternative explanation for the outcome, preventing a causal conclusion.
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Based on the provided example of the anti-bullying study, diagnose why the difference in student behavior policies between the schools makes it difficult to draw a causal conclusion about the anti-bullying program. In your explanation, describe how this scenario illustrates a selection effect.
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