Which of the Following Is True with Regard to Sigma

Multiple Choice

Which of the following is true with regard to sigma levels for the health care industry?

A) Operating at the 4σ quality level can be too demanding.
B) Operating at lower sigma levels given the inherent variation from one patient to another.
C) Operating at the 3σ quality level can be too risky.
D) Operating at the 3σ quality level can be too expensive.