Basic Flashcards
7 cards from real Certified Six Sigma Black Belt Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Basic flashcards as text
The 'Control' phase of DMAIC primarily uses which tool to sustain improvements after project completion?
Answer: Control plan and control charts
A control plan documents the monitoring approach, and control charts provide ongoing statistical signals to maintain process gains after the project is closed.
What is 'sigma shift' and why is it used in Six Sigma calculations?
Answer: A 1.5-sigma adjustment added to account for long-term process drift
A 1.5-sigma shift is added to short-term sigma calculations to account for typical long-term process drift and mean shifts, making the DPMO tables more realistic.
Which of the following is an example of a 'common cause' variation in a process?
Answer: Random fluctuations inherent to the process operating normally
Common cause variation is the natural, inherent random variation always present in a stable process — it can only be reduced by changing the process system.
What statistical tool is used to quantify the strength and direction of the linear relationship between two continuous variables?
Answer: Pearson correlation coefficient
The Pearson correlation coefficient (r) ranges from -1 to +1 and measures both the strength and direction of the linear relationship between two continuous variables.
In the context of Six Sigma project selection, a 'Business Case' should include:
Answer: The financial impact and strategic alignment of the project
A Business Case articulates why the project matters by linking it to financial impact, cost of poor quality, and strategic business objectives to justify resources.
Which sampling strategy ensures every member of the population has an equal chance of being selected?
Answer: Simple random sampling
Simple random sampling gives every unit in the population an equal and independent chance of being selected, minimizing selection bias.
A Black Belt notices that a control chart shows 8 consecutive points on one side of the centerline. This pattern indicates:
Answer: A special cause has shifted the process mean
Eight or more consecutive points on the same side of the centerline is a Western Electric run rule violation, signaling a likely process mean shift due to a special cause.