Assistant Statistical Officer Paper II · 8 Dispersion & Skewness · APPSC Paper I

8.1 Dispersion, skewness and the normal distribution notes

2 notes, in reading order.

  1. 8.1.1Dispersion: 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.

    Advanced · 11 min · Read here
  2. 8.1.2Moments, skewness (Karl Pearson and Bowley), kurtosis and the normal distribution

    Skewness measures the lack of symmetry of a distribution, kurtosis measures how peaked it is compared with the normal curve, and moments give one family of formulas for both; the normal distribution is the symmetric, mesokurtic benchmark.

    Advanced · 10 min · Read here

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