ASQ Certified Six Sigma Green Belt Examination Practice Test
The ASQ Certified Six Sigma Green Belt Examination (CSSGB) practice content centers on applying statistical and process-improvement methods to operational problems. Questions sample analysis of process variation, defect rates, workflow, and improvement opportunities, along with decisions about pilots and project objectives. The emphasis is on interpreting evidence and selecting a suitable tool or measure for the situation.
Exam overview
About the ASQ Certified Six Sigma Green Belt Examination Exam
Green Belt work connects project definition with data-based investigation and process change. A clear charter distinguishes the problem, measurable goal, and project boundaries; process maps and flow displays help teams locate handoffs, delays, and non-value-added activity. Statistical judgment matters when comparing averages with spread, choosing a robust measure of center, calculating DPMO or rolled throughput yield, and interpreting correlation without claiming causation. Teams also need to plan pilots so that results answer a defined question and can inform the next decision. These skills support practical tasks such as communicating performance, prioritizing process changes, assessing whether a change improves outcomes, and distinguishing routine variation from evidence that warrants further investigation.
Sample Practice Questions
Review a selection from this exam's published US Practice Tests practice bank.
A team reports that a new process has a lower average turnaround time, but the variability is much greater than before. Which summary is most useful for communicating both aspects of performance?
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Correct answer: BA measure of center and a measure of spread together provide a more complete description of process performance. Reporting only the average can hide increased inconsistency, while the maximum or sample size alone is insufficient.
A team has documented a process and wants to reduce unnecessary approvals and handoffs. Which improvement principle should guide its review?
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Correct answer: AProcess analysis distinguishes value-adding work from activities that consume resources without contributing needed value, such as avoidable handoffs or approvals. Teams should evaluate such steps for elimination or reduction while preserving required controls.
A team draws a graph of observations in the order they were collected, but does not calculate control limits. What is the primary use of this display?
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Correct answer: BA run chart displays data in time order and helps reveal trends, shifts, or other nonrandom patterns. Without control limits, it is not a control chart and does not directly establish statistical control.
A process improvement team wants to understand the sequence of activities, handoffs, and delays from request to completion before proposing changes. Which tool is most directly suited to documenting that flow?
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Correct answer: AA flowchart represents the steps and decision points in a process and can make handoffs, loops, and potential delays visible. The other options summarize data distributions or collect observations rather than map process sequence.
A team is planning a pilot of a revised order-entry form. Which action best helps ensure the pilot produces useful learning?
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Correct answer: AA planned pilot has a clear objective and measures, a defined scope, and criteria for reviewing results. This makes it easier to learn from both expected and unexpected outcomes before broader implementation.
A project charter states that a packaging line should reduce label-placement errors by 30% within six months. Which charter element does this statement primarily define?
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Correct answer: AA project goal describes the intended, measurable improvement and often includes a target and time frame. It does not establish causes or statistical control limits.
A process has four sequential steps with first-pass yields of 0.95, 0.90, 0.98, and 0.97. Assuming each step’s yield applies to items reaching that step, what is the approximate rolled throughput yield?
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Correct answer: ARolled throughput yield is the product of the step yields: 0.95 × 0.90 × 0.98 × 0.97 ≈ 0.814. The closest option is 0.80. This estimates the probability that an item passes all steps without rework or defects.
How to use this practice test
Access is free. A practice session draws up to 20 random questions from the available 50-question bank and displays results afterward. Use each session to test tool selection and calculations, then revisit missed items by identifying the relevant process measure or statistical concept before trying another question set.
Preparation tips
- Practice calculating DPMO and rolled throughput yield, keeping track of defect opportunities and the sequence of process-step yields.
- Compare mean, median, and variability when describing process performance; note how extreme observations can affect the mean.
- Distinguish a time-ordered run chart from a control chart with control limits, and identify what each display can show.
- Use process maps to trace handoffs and delays, then evaluate whether proposed changes remove non-value-added steps.
- For pilot scenarios, define what outcome to measure and how the results will guide the next process decision.