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Six Sigma improving survey methods
What is Six Sigma? 'Sigma' is a statistical term for measuring how far a product differs from perfection. 'Six Sigma' means six standard deviations between mean and nearest specific limit. The main goal for applying Six Sigma is to reach as close to zero defect as possible. Six Sigma can be approached on three levels: Metrics, Methodology, Philosophy
Read more at http://www.surveymethods.com/glossary/article_six_sigma_seg_l.aspx
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