Practice Quiz

Six Sigma Green Belt

Category - Black Belt

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A Black Belt practitioner wishes to improve the efficiency and output of processes of a company manufacturing office equipment by raising its performance from 2 to 3 Sigma. By how much would this increase reduce production defects?
  1. by a factor of 4.6
  2. by a factor of 6.4
  3. by a factor of 8.6
  4. none at all
Explanation
Answer: A - This increase would reduce defects per million by a factor of 4.6.

Key Takeaway: A 2 sigma defect rate is 308,538 ppm while a 3 Sigma defect rate is 66,810 which translates to a 4.6-fold reduction in defects per million.
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