Multiple choice six-sigma green-belt

If Zst is 4. Zlt will be

  1. 5.5

  2. 2.5

  3. 3.5

  4. 4.5
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Zst (Sigma short-term) excludes long-term process variations, while Zlt (Sigma long-term) includes them. The relationship is Zlt = Zst - 1.5. This 1.5 sigma shift accounts for long-term process degradation. Therefore if Zst is 4, Zlt = 4 - 1.5 = 2.5.

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