The following texts were referenced in creating this content:
Jarrar, Y., Neely, A. B. Six Sigma – Friend or Foe?. Informally published manuscript, Centre for Business Performance, Cranfield School of Management, Cranfield, Bedfordshire United Kingdom, Retrieved from http://www.som.cranfield.ac.uk/som/dinamic-content/research/cbp/CBPupdate1-SixSigmaFriendOrFoe.pdf
Lind, D., & Marchal, W. (2008). Statistical techniques in business & economics (13th ed.). Boston: McGraw-Hill/Irwin.
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