Paper II · 2 Central Tendency, Dispersion, Skewness & Kurtosis · 2.2 Dispersion, skewness and the normal distribution

2.2.1 Dispersion: range, quartile deviation, mean deviation, standard deviation, variance and coefficient of variation

Dispersion measures how far the values of a series are scattered around their average: range and quartile deviation use positions, mean deviation and standard deviation use every value, and the coefficient of variation compares spread across series.

  • TGPSC MPSO / ASO · Paper II
  • Advanced level
  • 11 min read
  • Full course

Key terms

  • dispersion
  • variation
  • absolute measure
  • relative measure
  • range
  • coefficient of range
  • quartile deviation
  • semi-interquartile range
  • coefficient of quartile deviation
  • mean deviation
  • coefficient of mean deviation
  • standard deviation
  • variance
  • step deviation
  • combined standard deviation
  • coefficient of variation
  • consistency
  • Lorenz curve

What this note covers

  1. Core factsFoundation
  2. ExplainedStandard
  3. DeeperAdvanced
  4. Mains writingMains writing
  5. Common trapsFoundation
  6. Quick revisionFoundation

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