Cheat sheet · Class 11 · CBSE · Commerce Economics
Statistics: Correlation cheat sheet
The whole chapter on one page: key formulas, facts and the points to remember, for quick revision before a test.
CBSE Class 11 · Economics
Cheat sheet
Chapter 6Statistics: Correlation
r lies between −1 and +1; r = 0 means no linear relation.
1. Types
- Positive (both move together), negative (opposite).
- Perfect, high, moderate, low, zero.
Scatter diagram shows the direction visually.
2. Karl Pearson's Coefficient
where ,
r is independent of change of origin and scale.
3. Spearman's Rank
For ranks / qualitative data; tied ranks need correction.
4. Key Points
- Correlation doesn't prove causation.
- Pearson measures linear relation only.
- r = ±1: perfect correlation.
- Rank method for attributes like beauty.
Remember: Scatter | Pearson r | Spearman rank
Statistics: Correlation: questions and notes
More Class 11 · CBSE · Commerce Economics cheat sheets
- Statistics: Introduction
- Statistics: Collection of Data
- Statistics: Organisation of Data
- Statistics: Presentation of Data
- Statistics: Measures of Central Tendency
- Statistics: Correlation
- Statistics: Index Numbers
- Microeconomics: Introduction
- Microeconomics: Theory of Consumer Behaviour
- Microeconomics: Production and Costs
- Microeconomics: The Theory of the Firm under Perfect Competition
- Microeconomics: Market Equilibrium
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