Same chapter3 marksDifficulty: Medium
Distinguish between positive and negative correlation, giving one example of each.
Correlation Analysis
3 marksDifficulty: Medium
The ranks of six students in two subjects give Σd2 = 30. Calculate Spearman's coefficient of rank correlation.
Original Khojo Papers practice question — not from a past board paper.
Answer
1 − 180/210 = 1/7, about 0.143
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The formula is 1 − 6Σd2/[n(n2 − 1)] = 1 − (6 × 30)/(6 × 35) = 1 − 180/210.
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