A change in quality level from 3-sigma to 4-sigma represents a:
a. 1-fold improvement.
b. 2-fold improvement.
c. 5-fold improvement.
d. 10-fold improvement.
Answer: 10-fold improvement
a. 1-fold improvement.
b. 2-fold improvement.
c. 5-fold improvement.
d. 10-fold improvement.
Answer: 10-fold improvement