Ch 5 · Correlation and Regression

5 concept points · 5 formulas · 4 exam-critical points.

🧮 Formula sheet

1. r = Σ[(x − x̄)(y − ȳ)] / √[Σ(x − x̄)² · Σ(y − ȳ)²]
2. Spearman R = 1 − 6Σd² / [n(n² − 1)]
3. Regression Y on X: byx = r(σy/σx)
4. Regression X on Y: bxy = r(σx/σy)
5. r² = byx · bxy (Coefficient of determination)