IASSC Certified Lean Six Sigma Green Belt (ICGB) — Question 1

If a process has Outliers which pair of charts is most preferable if subgroups will exist for the Continuous Data?

Answer options

• A. Individual—Moving Range
• B. Xbar-R Charts
• C. Xbar-S Charts
• D. nP and P Charts

Correct answer: B

Explanation

The Xbar-R Charts are ideal for monitoring the mean and variability of subgroups in Continuous Data, especially when outliers are present. Other options like Individual—Moving Range and Xbar-S Charts may not effectively capture subgroup variations, and nP and P Charts are more suited for attribute data.