Standard deviation is calculated by taking the square root of the variance, which itself is the average of the squared differences of the mean. The formula is: One of the reasons for the ...

The reason we go through such a complicated process to define standard deviation is because this measure appears as a parameter in a number of statistical and probabilistic formulas, most notably ...

Six Sigma is a data-driven approach to quality, aimed at reducing variation and the associated defects, wastes, and risks in any process. This article explores the basics of Six Sigma process quality ...