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A five-year student study loses many participants who move frequently, while students who remain are mostly from stable households. What threat does this create?

Answer and explanation

Correct answer: Attrition bias because those remaining may differ systematically from those who left

When participants leave a study for reasons related to the outcomes being examined, the remaining group may become unrepresentative. This is attrition bias and can distort conclusions about changes over time.

Related tags

Attrition BiasLongitudinal ResearchSample RepresentativenessEducation

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