Choosing a Research Topic
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Variance of b₂ is σ²_u / Σ(X_i - X̄)². Doubling n by adding more X values (with similar spread) generally increases Σ(X_i - X̄)², thus decreasing the variance. However, if new X values are very close to X̄, the increase may be small.
Break down complex topics into smaller, manageable chunks for easier recall.
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