Mixed Deck — All Certified Six Sigma Black Belt Exam Topics Flashcards
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A Black Belt is facilitating a lessons-learned session at project close. What is the PRIMARY goal of this activity?
Answer: To capture knowledge that improves future Six Sigma projects and organizational learning
Lessons-learned sessions extract transferable insights—both successes and failures—to build institutional knowledge for future improvement efforts.
In a DMAIC project, DOE is most commonly conducted during which phase?
Answer: Improve
DOE is a key tool in the Improve phase, used to actively manipulate process inputs to optimize the response output after critical factors have been identified in Analyze.
After implementing a process improvement, a Black Belt collects two independent data sets — one from before the change and one from after — and wants to statistically confirm that the process mean has shifted. Which hypothesis test is most appropriate?
Answer: Two-sample t-test
A two-sample t-test compares the means of two independent groups. Because the before and after samples are drawn from different (independent) process runs, this is the correct choice. A paired t-test applies when the same units are measured twice; chi-square and proportion z-tests are used for categorical or count data, not continuous means.
Which of the following best describes the purpose of a SIPOC diagram in the Define phase?
Answer: To provide a high-level view of the process and identify key stakeholders and boundaries
A SIPOC diagram gives project teams a macro-level view of the process, capturing Suppliers, Inputs, Process steps, Outputs, and Customers to establish scope.
In a supply chain context, which lean waste category describes transporting materials more than necessary?
Answer: Transportation
Transportation waste refers to unnecessary movement of materials or products between process steps.
Which of the following tools should be used when there are several criteria and only one possible option?
Answer: Pugh matrix
A Pugh matrix (also known as a decision matrix or selection matrix) is a structured tool used to evaluate multiple alternatives against a set of criteria. It's particularly useful when there are several options and a need to systematically compare and select the best one based on weighted criteria. This tool helps in making objective decisions by scoring each option against a baseline.
Which DMAIC phase involves piloting solutions and verifying they address the root cause before full deployment?
Answer: Improve
The Improve phase is where solutions are developed, piloted, and verified to confirm they effectively address root causes.
The mean of a sample drawn at random from a population is not the same as the mean of the population. This is because:
Answer: Sampling error
Sampling error is the natural and expected discrepancy that occurs between a sample statistic (like the sample mean) and the true population parameter (like the population mean). It arises because a sample is only a subset of the population and, by chance, will not perfectly mirror the entire population. This inherent variability is a fundamental aspect of inferential statistics and is not due to measurement inaccuracies or errors in hypothesis testing.
The 'D' in DMAIC stands for:
Answer: Define
DMAIC = Define, Measure, Analyze, Improve, Control.
Which VOC technique involves observing customers in their natural environment to discover unarticulated needs they cannot describe in a survey?
Answer: Ethnographic research
Ethnographic research (contextual observation) reveals tacit needs by watching customers use a product in their real context.
In a control chart, what does the term 'common cause variation' describe?
Answer: Variation inherent to the process operating normally
Common cause variation (also called natural or random variation) is the inherent, predictable variation present in any stable process. It is distinguished from special cause variation, which arises from assignable, non-routine sources.
What is the primary risk of using a high alpha level (e.g., 0.10) in hypothesis testing during a Six Sigma project?
Answer: Increased probability of a Type I error
A higher alpha level increases the probability of rejecting the null hypothesis when it is actually true, which is a Type I error.
Which group decision-making technique is BEST suited for ensuring all team members' ideas are heard equally before prioritizing solutions?
Answer: Nominal Group Technique (NGT)
NGT structures idea generation and voting to equalize participation and reduce dominance by vocal individuals.
Which Lean tool uses a visual board with columns such as To Do, In Progress, and Done to manage workflow?
Answer: Kanban
Kanban boards visualize work-in-progress and workflow stages to limit WIP and improve flow.
During the Measure phase, a Black Belt discovers that a key subject matter expert is withholding data due to fear of job loss. What leadership technique should the Black Belt apply first?
Answer: Build trust by explaining how the project benefits the expert's work area
Building trust and demonstrating mutual benefit is the most effective way to overcome resistance rooted in fear.
A project team is conducting an experiment to optimize a chemical process. To prevent unforeseen variables, such as changes in ambient temperature or raw material batch variations throughout the day, from systematically biasing the results, the team decides to run the experimental trials in a non-sequential, randomly generated order. This practice is known as:
Answer: Randomization
Randomization is the practice of running experimental trials in a random order. Its purpose is to average out the effects of 'lurking' or nuisance variables that are not controlled in the experiment, ensuring they do not systematically influence the results and lead to incorrect conclusions.
When conducting a two-proportion z-test, what is the null hypothesis typically stated as?
Answer: p₁ = p₂
The null hypothesis for a two-proportion z-test states that the two population proportions are equal.
What is the primary purpose of calculating statistical power in a hypothesis test?
Answer: To determine the sample size needed
Statistical power analysis is primarily used to determine the minimum sample size required to detect a meaningful effect at a given significance level.
During enterprise-wide deployment, a Business Unit leader resists adopting Six Sigma, claiming their unit is already high-performing. What is the MOST effective response?
Answer: Benchmark the unit's performance against industry best-in-class and identify specific gaps
Benchmarking against best-in-class performance objectively demonstrates improvement opportunities and converts resistance based on perceived adequacy.
What is the defining relation used to determine the alias structure of a fractional factorial design?
Answer: The set of generators and their generalized interactions that equal the identity column
The defining relation consists of all words formed by the generators and their products set equal to I, which determines every alias pair in the design.