Practice 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 Practice flashcards as text
A Black Belt is analyzing a process with a mean of 50 and standard deviation of 5. If the USL is 65 and LSL is 35, what is the process Cpk?
Answer: 1.00
Cpk = min((USL-mean)/3σ, (mean-LSL)/3σ) = min(15/15, 15/15) = 1.00.
During a DMAIC project, a team discovers that a key input variable accounts for 78% of output variation. This finding most likely comes from which tool?
Answer: Regression analysis
Regression analysis quantifies the proportion of variance in the output explained by input variables (R²).
A process produces 3.4 defects per million opportunities. This corresponds to which sigma level?
Answer: 6σ
Six Sigma quality is defined as 3.4 DPMO, accounting for a 1.5σ long-term shift.
Which type of hypothesis test would you use to compare the means of three or more independent groups simultaneously?
Answer: One-way ANOVA
One-way ANOVA tests whether the means of three or more groups are statistically equal.
In a full factorial DOE with 3 factors each at 2 levels, how many experimental runs are required (without replication)?
Answer: 8
A 2³ full factorial design requires 2³ = 8 runs.
A control chart shows a run of 8 consecutive points on one side of the center line. This indicates:
Answer: A special cause signal
Eight consecutive points on the same side of the centerline is a standard Western Electric rule for a special cause signal.
Which lean tool is used to visually distinguish normal from abnormal conditions in a workplace at a glance?
Answer: Visual management
Visual management uses displays, color-coding, and markings so abnormal conditions are immediately obvious.