⭐ Important points (exam-critical)
- ⭐Both regression coefficients have the same sign as r.
- ⭐Product of regression coefficients ≤ 1 (since |r| ≤ 1).
- ⭐Probable Error = 0.6745 × (1 − r²)/√n (used for significance check).
- ⭐Distinguish regression from correlation — regression has cause-effect direction.
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