Six Sigma Green Belt Study Guide: Test Prep Book & Practice Test Questions for the ASQ Six Sigma Green Belt Exam by Six Sigma Green Belt Exam Prep Team

Author:Six Sigma Green Belt Exam Prep Team
Language: eng
Format: azw3
Published: 2017-03-28T04:00:00+00:00

Spread

Methods for determining the spread of the sample include calculating the range and standard deviation for the data. The range is calculated by subtracting the lowest value from the highest value in the set. The standard deviation of the sample can be calculated using the formula:

= sample mean

n = sample size

Shape

The shape of the sample when displayed as a histogram or frequency distribution plot helps determine if the sample is normally distributed, symmetrical, or skewed (asymmetrical); the shape can also indicate the sample’s level of kurtosis. Kurtosis is a measure of whether the data are heavy-tailed (high number of outliers) or light-tailed (low number of outliers).

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