Free ASQ Certified Six Sigma Black Belt (CSSBB) exam Practice Questions

Sample Practice Questions

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

1. 1How do Lean and Six Sigma complement each other in a combined improvement program?

   1. A. Lean primarily controls variation; Six Sigma primarily improves flow.
   2. B. Lean targets waste and flow; Six Sigma targets process variation.
   3. C. Both methods primarily target waste, leaving variation outside their focus.
   4. D. Both methods primarily target variation, leaving flow outside their focus.

   Answer: B

   Explanation: The source states, "Lean’s focus on eliminating waste and improving speed of processes is complemented with Six Sigma’s focus on eliminating variation and improving product quality." Lean and Six Sigma have complementary emphases. Reversing their emphases or treating them as identical misses the waste/flow and variation relationship.

   Reference: The Environmental Professional’s Guide to Lean & Six Sigma — Chapter 1, p. 4

2. 2A service improvement removes non-value-added waiting while preserving the work required to deliver the service. What direct customer impact is expected?

   1. A. A longer wait for the same service
   2. B. A shorter end-to-end delivery time
   3. C. A higher number of required handoffs
   4. D. A greater need to repeat the request

   Answer: B

   Explanation: The source states, "Reduce the total time it takes to complete a process" Removing waiting reduces the customer's elapsed time; it does not require more handoffs or repeated requests.

   Reference: Lean in Government Starter Kit Version 4.0 — Chapter 2, Benefits of Lean, p. 12

3. 3A project spans purchasing, production, and shipping. Which team composition best supports understanding the full process?

   1. A. Only analysts who have never observed the process
   2. B. Only managers from the department funding the project
   3. C. Representatives from the functions that operate and interact with the process
   4. D. Representatives from one function with the highest transaction volume

   Answer: C

   Explanation: The source states, "Ensure the team has cross-functional representation." A cross-functional team brings the relevant handoff and operating knowledge; selecting only one perspective leaves gaps.

   Reference: Lean in Government Starter Kit Version 4.0 — Chapter 4, participant selection, p. 36

4. 4A payroll process delivers completed payroll information to the company's accounting department. How is accounting classified in relation to that output?

   1. A. An external supplier
   2. B. An internal customer
   3. C. An external customer
   4. D. A process input

   Answer: B

   Explanation: The source states, "Customers: Anyone (external and internal) that receives the output from the process" Accounting receives the output and belongs to the same organization, making it an internal customer.

   Reference: Lean in Government Starter Kit Version 4.0 — Chapter 4, SIPOC Analysis, p. 40

5. 5A service request spends 3 hours in actual processing and 9 hours waiting, with no overlap. What is its end-to-end lead time?

   1. A. 3 hours
   2. B. 6 hours
   3. C. 12 hours
   4. D. 27 hours

   Answer: C

   Explanation: The source states, "including waiting time" Lead time includes processing and waiting: 3 + 9 = 12 hours.

   Reference: Lean Government Metrics Guide — Table 2, Lead Time, p. 4

6. 6A Pearson correlation coefficient is −0.90. What does this indicate?

   1. A. A strong negative linear association
   2. B. A weak positive linear association
   3. C. A 90% probability that X causes Y
   4. D. An absence of any linear relationship

   Answer: A

   Explanation: The source states, "A perfect linear relationship yields a correlation coefficient of +1 (or -1 for a negative relationship)" The sign gives direction and proximity to −1 indicates strong negative linear association; correlation is not a causal probability.

   Reference: NIST Dataplot Reference Manual — Correlation — Description

7. 7An experiment deliberately changes cure temperature and records the resulting bond strength. How are these two quantities classified?

   1. A. Temperature is a response; strength is a factor.
   2. B. Temperature is a factor; strength is a response.
   3. C. Both quantities are factors set by the experimenter.
   4. D. Both quantities are responses measured after treatment.

   Answer: B

   Explanation: The source states, "we deliberately change one or more process variables (or factors) in order to observe the effect the changes have on one or more response variables." Temperature is the manipulated input and bond strength is the measured output.

   Reference: NIST/SEMATECH e-Handbook of Statistical Methods — 5.1.1, What is experimental design?

8. 8Daily inspection samples vary in size, and each inspected unit is classified as conforming or nonconforming. Which chart monitors the fraction nonconforming?

   1. A. c chart
   2. B. p chart
   3. C. u chart
   4. D. Individuals chart

   Answer: B

   Explanation: The source states, "Control charts dealing with the proportion or fraction of defective product are called p charts" A p chart monitors a binary unit classification as a fraction. A c chart counts nonconformities, a u chart monitors nonconformities per unit, and an individuals chart handles individual variable measurements.

   Reference: NIST/SEMATECH e-Handbook of Statistical Methods — 6.3.3, What are Attributes Control Charts?

9. 9Which sequence names the five phases of DMADV using the terminology in the 2022 CSSBB Body of Knowledge?

   1. A. Define, measure, analyze, improve, control.
   2. B. Define, measure, analyze, design, validate.
   3. C. Define, design, measure, analyze, control.
   4. D. Define, measure, design, improve, validate.

   Answer: B

   Explanation: The source states, "define, measure, analyze, design, and validate (DMADV)" DMADV proceeds from defining and measuring through analysis, design, and validation. DMAIC instead concludes with Improve and Control.

   Reference: CSSBB Body of Knowledge — IX.A, Common DFSS Methodologies, p. 14

10. 10An existing process has inconsistent results, abundant numerical data, and several potential interacting causes. Which approach is most directly suited to diagnosing its variation?

    1. A. A 5S effort focused on arranging workplace items
    2. B. A visual-control effort focused on displaying work status
    3. C. A Six Sigma project using statistical analysis
    4. D. A standard-work effort copying the current sequence

    Answer: C

    Explanation: EPA explains, "Six Sigma projects depend on statistical tools for analyzing problems involving multiple variables". The stated problem calls for analysis of variation rather than workplace organization or immediate standardization.

    Reference: Lean Government Methods Guide — Overview of Lean Methods, p. 2