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Measures of Dispersion

Measures of dispersion measure the spread of the data. Dispersion is central to process improvement because a fundamental aim of Six Sigma is to minimize the amount of variation.

The 'standard deviation' is the most common measure of process improvement. The Mean Square Error is a closely related concept used in, for example, ANOVA.

Measures of Dispersion include:

 Range Standard Deviation Variance

 Analytical and descriptive statistics are covered in the MiC Quality online course Primer in Statistics. Try out our courses by taking the first module of the Primer in Statistics free of charge.
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