Same chapter3 marksDifficulty: Medium
Distinguish between positive and negative correlation, giving one example of each.
Correlation Analysis
3 marksDifficulty: Medium
When is Spearman's rank correlation used in preference to Karl Pearson's coefficient?
Original Khojo Papers practice question — not from a past board paper.
Answer
Rank correlation is used when the data are qualitative and can only be ranked rather than measured, as with the beauty of contestants or the quality of essays, and when the distribution is badly skewed or contains extreme values that would distort Pearson's coefficient.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
It is also simpler to compute when only ranks are given.
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