measures of dispersion

measures of dispersion

1. Standard deviation

   • It is the square root of the variance
   • It is represented by
   • Also used for grouped data

2. Mean deviation

   • Arithmetic measure of the absolute values of the deviations from the men
   • Used for grouped data using frequency tables
   • Diference in absolute value between each value of the statiscal variable and the arithmetic mean

3. Variance

   • Asymmetric measure of the square of the deviations from the mean
   • It has formulas
     • Simmple
     • For grouped data
   • Is a positive amount

4. Coefficient of variation

   • Ratio between the standard
   • Compare the spreads of two diferent distributions when their means are positive
   • The greatest dispersion corresponds to the value of the greatest coefficient of variation

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