College Algebra Quiz
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MODELING, WORD PROBLEMS & QUANTITATIVE REASONING
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A educational researcher examines the relationship between class size (x) and average test scores (y) across 45 elementary schools. The regression analysis shows y=87.2−1.3x with r2=0.52. The residual plot reveals that schools with class sizes above 28 students show much more scattered residuals than schools with smaller classes. What does this pattern suggest about the model's applicability?
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