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Data Collectionhard
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An economist regresses test scores (Y) on school funding (X) across 500 schools: Y^=50+0.50X\hat{Y} = 50 + 0.50XY^=50+0.50X, suggesting a $1,000 funding increase correlates with 0.5-point higher scores. Schools in wealthy districts receive higher funding AND have more educated parents. Why does this regression likely overestimate the causal effect of funding?