Chapter 4 of 9
Revision Notes
Measures of Dispersion — Revision Notes
Gujarat Board · Class 11 · Statistics
Measures of Dispersion revision notes for Gujarat Board Class 11 Statistics: 4 topics in quick points. Includes 1 Meaning and Characteristics, 2 Absolute.
44 questions24 flashcards2 formulas & key relations5 concepts
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Key Topics to Revise
1
4.1 Meaning and Characteristics of Dispersion
- Dispersion shows how far observations are scattered from the measure of average
- Only measures of central tendency are insufficient for complete data analysis
- Two groups can have same mean but different dispersions
2
4.2 Absolute vs Relative Measures
- Absolute measures are expressed in same units as original data
- Relative measures are unit-free and used for comparison
- Relative measures are ratios of absolute measures to appropriate averages
3
4.3.1 Range
- Simplest measure of dispersion
- Based only on extreme values
- Easy to calculate but not very reliable
4
4.3.2 Quartile Deviation
- Based on middle 50% of observations
- Less affected by extreme values
- Also called semi-inter-quartile range
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Full NotesKey Concepts
A measure that shows how farAbsolute measures are expressed inThe simplest measure of dispersion calculatedA positional measure based onThe average of absolute deviations
Frequently Asked Questions
What are the important topics in Measures of Dispersion for Gujarat Board Class 11 Statistics?
Key topics in Measures of Dispersion include 1 Meaning and Characteristics of Dispersion, 2 Absolute vs Relative Measures, 3.1 Range, 3.2 Quartile Deviation. Study these first, then practise questions on each for Class 11 exams.
How should I revise Measures of Dispersion for Class 11 exams?
Learn the core ideas first, then work through the 44 practice questions on Measures of Dispersion. Revise definitions regularly and use flashcards for quick recall before the exam.
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