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Measures of Dispersion

Gujarat Board · Class 11 · Statistics

Quick revision notes for Measures of Dispersion — Gujarat Board Class 11 Statistics. Key concepts, formulas, and definitions for last-minute revision.

44 questions24 flashcards5 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 Notes

Key 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?
Measures of Dispersion covers several key topics that are frequently asked in Gujarat Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Measures of Dispersion — Gujarat Board Class 11 Statistics?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

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