Measures Of Dispersion — Chapter Summary

The range is the simplest measure

The range is the simplest measure of dispersion. It is calculated as the difference between the highest and lowest values in a data set. For example,

Mean deviation is the average

Mean deviation is the average of the absolute differences between each data point and the mean (or median). For ungrouped data, it is calculated as th

Variance is the average of

Variance is the average of the squared differences from the mean. For ungrouped data, it is the sum of squared deviations divided by the number of obs

Standard deviation is the positive square

Standard deviation is the positive square root of the variance. It is denoted by σ (sigma) and is expressed in the same units as the original data, ma