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     Dictionary of Quality, Research, and Six Sigma TerminologyHelp

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Sigma
The word representing the letter "S" in the Greek alphabet; in statistical analysis, a symbol, expressed as a lower-case "s," representing a population's standard deviation. When used in the business management context, it functions as a measure of process capability; a correlation exists between the standard deviation from a process's mean and the probable number of defects per million opportunities.
 
 
 
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