Six Sigma Black Belt Exam Prep

Answer: B - The S stands for standard deviation.

Key Takeaway: The Coefficient of Variation measures relative variation in a data set and is always shown as a percentage. The standard deviation of a data set is divided by the mean which shows a variation relative to the mean of the data set. This type of statistic can be used to measure the variation of two data sets; for example, the dimensions of pencils produced by two machines can be compared in terms of variation to gauge their precision.