View Question
Q: Six Sigma ( Answered ,   1 Comment )
 Question
 Subject: Six Sigma Category: Business and Money > Economics Asked by: tomandsharonz-ga List Price: \$2.00 Posted: 02 Feb 2005 09:18 PST Expires: 04 Mar 2005 09:18 PST Question ID: 467582
 `How is six-sigma verified statistically?`
 ```Hi, thank you for submitting your question to Answers.Google, I hope I can provide the information you are seeking. Six sigma, a mathematical term with a very specific meaning, has been appropriated by the business community to indicate a high level of quality. Six sigma is also the designation for a high-IQ society similar to Mensa but with much more stringent requirements. A six sigma club today is more likely to be related to some high level of manufacturing capability. Six sigma?s mathematical meaning is that something measured comes within + or ? six sigma (standard deviations) of a specified average. In manufacturing this means about 3.4 defects in one million cases whether this is customer responses, or manufactured items. Just what constitutes a defect is always open to interpretation but once that is established then determining six sigma qualification is simply a matter of counting. A standard deviation isn?t a specific number except in a specific case. It is defined as the square root of the average of the squares of the amount individual measurements differ from the mean (similar to the average.) You can learn about implementing 6-sigma quality procedures in a business at www.isixsigma.com/sixsigma/six_sigma.asp Google search string: six sigma Google search string: define:standard deviation So, a six sigma quality control program would result in 99.9997% perfect results. Members of the six sigma IQ club have an IQ higher than 99.9997% of the population (for Mensa it is only 98%.) How do you verify or demonstrate this? Simple, count the number of mistakes or defects and compare that to the total number of events or products. If there are fewer than one bad outcome for every 300,000 then you have achieved six sigma quality. Thank you again for turning to Answers.Google for help. I feel this is a very complete answer for the price and hope you agree.```
 tomandsharonz-ga rated this answer: `Exactly what I was looking for... Thank you! Tom Z.`
 ```This answer is technically incorrect. Six sigma?s mathematical meaning is that something measured comes within + or ? six sigma (standard deviations) of a specified average.In manufacturing this means about 3.4 defects in one million cases. If you calculate +/- 6 sd of a process, it produces far fewer defects than 3.4. Six sigma assumes processes will shift 1.5 standard deviations in the long run. Using that shift is how six sigma and 3.4 defects per million opportunities are associated. You can learn more about six sigma at www.danfeliciano.com or @ www.sixsigmablackbelt.com```