Free Certified Six Sigma Yellow Belt Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Certified Six Sigma Yellow Belt practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1What is the central process-improvement aim of Six Sigma?

   1. A. Increase the amount of final inspection
   2. B. Reduce variation that contributes to defects
   3. C. Increase the range of acceptable customer needs
   4. D. Reduce the frequency of measuring performance

   Answer: B

   Explanation: ASQ states that "Six Sigma emphasizes variation reduction." Reducing variation helps a process deliver more consistent results; increasing inspection does not itself remove variation.

   Reference: Six Sigma — What Is Lean Six Sigma?

2. 2What does the voice of the customer communicate to a process-improvement team?

   1. A. The supplier's preferred production schedule
   2. B. The team's preferred technical solution
   3. C. The process owner's annual operating budget
   4. D. Customers' requirements and expectations

   Answer: D

   Explanation: ASQ defines VOC as "The expressed requirements and expectations of customers". It describes what customers need from the product or service, rather than the team's chosen solution.

   Reference: Quality Glossary — Voice of the customer

3. 3Five observed completion times are 4, 6, 7, 8, and 10 minutes. What is their arithmetic mean?

   1. A. 6 minutes
   2. B. 7 minutes
   3. C. 8 minutes
   4. D. 9 minutes

   Answer: B

   Explanation: NIST states: "the mean is the sum of the data points divided by the number of data points." The sum is 35 minutes, and 35 / 5 = 7 minutes.

   Reference: NIST/SEMATECH e-Handbook — Measures of Location — Definition of Location — mean

4. 4A workplace contains obsolete tools mixed with tools still needed for daily work. Which 5S step separates needed from unneeded items?

   1. A. Shine
   2. B. Sustain
   3. C. Sort
   4. D. Standardize

   Answer: C

   Explanation: ASQ describes Sort as "separate needed items" from unneeded items. Identifying and removing unnecessary items precedes arranging or cleaning the retained workspace.

   Reference: Five S Tutorial — ASQ — What Are the Five S's of Lean? — Seiri

5. 5Which pattern of process improvement is associated with the kaizen approach?

   1. A. Making a single large redesign across the entire organization
   2. B. Waiting for a breakthrough to replace the existing process
   3. C. Making continuing small, incremental process improvements
   4. D. Restoring prior operating performance after each breakdown

   Answer: C

   Explanation: The handbook describes kaizen as improving processes through "small, incremental steps." It supports continuing improvement rather than postponing all change until a large redesign.

   Reference: The ASQ Certified Six Sigma Yellow Belt Handbook, Second Edition — Chapter 2, p. 21, Kaizen versus Kaizen Event

6. 6Which DMAIC phase establishes the problem and the goals of an improvement project?

   1. A. Define
   2. B. Measure
   3. C. Analyze
   4. D. Improve

   Answer: A

   Explanation: ASQ explains: "The team defines the problem and project goals". This is the Define phase; measuring performance, finding causes, and evaluating solutions follow.

   Reference: DMAIC — What are the DMAIC phases? — Define

7. 7A customer requests a particular product feature. Why should a team ask what benefit the customer seeks from that feature?

   1. A. To avoid documenting the original feedback
   2. B. To identify the underlying need that different solutions could satisfy
   3. C. To replace customer priorities with technical preferences
   4. D. To treat the requested feature as the only acceptable design

   Answer: B

   Explanation: ASQ states: "an organization needs to know why customers want certain features." Understanding the benefit separates the need from one proposed implementation.

   Reference: Voice of the Customer — Translating VOC into Customer Needs

8. 8What is the median of the observations 9, 3, 12, 5, and 7?

   1. A. 5
   2. B. 9
   3. C. 7
   4. D. 12

   Answer: C

   Explanation: NIST defines the median using a sample "sorted from smallest value to largest value". Sorting gives 3, 5, 7, 9, 12; the middle observation is 7.

   Reference: NIST/SEMATECH e-Handbook — Measures of Location — Definition of Location — median

9. 9After removing unnecessary items, workers give each frequently used tool a labeled, easily reached location. Which 5S step is illustrated?

   1. A. Set in order
   2. B. Sort
   3. C. Shine
   4. D. Sustain

   Answer: A

   Explanation: ASQ describes Seiton as arranging items "for ease of use". Assigning accessible locations organizes needed tools instead of sorting them out or cleaning them.

   Reference: Five S Tutorial — ASQ — What Are the Five S's of Lean? — Seiton

10. 10What distinguishes a kaizen blitz from a typical long-duration improvement project?

    1. A. Concentrated short-duration work implementing a focused change
    2. B. Part-time project work distributed across several monthly phases
    3. C. Extended design followed by a single organization-wide conversion
    4. D. Recurring planning meetings that hand implementation to later projects

    Answer: A

    Explanation: ASQ describes a kaizen event as "an intense progression through the DMAIC process typically done in about a week." It concentrates effort to achieve rapid change rather than stretching routine project work over months.

    Reference: DMAIC — ASQ — When to use DMAIC — Kaizen event