Ch 5 · Correlation and Regression

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

📘 Core concepts

• 1Correlation measures direction and strength of linear relation (−1 to +1).
• 2Karl Pearson's coefficient is for quantitative data.
• 3Spearman's rank correlation for qualitative / ranked data.
• 4Regression: estimating one variable based on another using best-fit line.
• 5Two regression lines: Y on X and X on Y; intersect at (x̄, ȳ).