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Multiple Choice

A researcher begins a 10-year study to track the long-term cognitive benefits of a new preschool curriculum, starting with 500 children from diverse socioeconomic backgrounds. By the end of the study, only 250 children remain. The data reveals that most of the children who left the study were from low-income families who had moved frequently. What is the most significant threat this situation poses to the researcher's conclusions?

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Updated 2025-10-09

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