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Summary

  • Measures of dispersion are range, mean deviation, variance and standard deviation.
  • Range = [largest value - smallest value].
  • Mean deviation for an ungrouped data: MD; M.D(M)
  • Mean deviation for grouped data: MD; M.D(M)
  • Variance and S.D for ungrouped data:
  • Variance and S.D for ungrouped data using assumed mean:
  • Variance and S.D of a continuous frequency distribution:
    A is assumed mean h is the common factor for all deviations.

  • Coefficient of variation (C.V) = ,
  • For two or more series with equal means, the series with lesser S.D is more consistent and less scattered.
  • For comparision of two or more sets of data, the one which has least C.V is more consistent and less scattered




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