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?

Question

Quizplus · Accepted Answer

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.

A Black Belt Practitioner Wishes to Improve the Efficiency and Output