Certification Exam Practice Test

Certified Six Sigma Green Belt (CSSGB) Certification Exam Practice Test Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which phase of DMAIC focuses on identifying the root causes of

defects?

• Define
• Measure
• Analyze
• Control
• Analyze

Rationale: The Analyze phase is where teams use data and tools like

cause-and-effect diagrams and regression analysis to identify root causes of process defects. 1 / 4

• What does the acronym SIPOC stand for?
• Suppliers, Inputs, Process, Outputs, Customers
• Standards, Inputs, Process, Outputs, Control
• Suppliers, Implementation, Process, Operations, Customers
• Systems, Inputs, Performance, Outputs, Customers
• Suppliers, Inputs, Process, Outputs, Customers

Rationale: SIPOC is a high-level process mapping tool that identifies

Suppliers, Inputs, Process, Outputs, and Customers.

• In Six Sigma, what does “CTQ” stand for?
• Critical to Quality
• Control to Quality
• Customer Test Qualification
• Critical Timing Quantification
• Critical to Quality

Rationale: CTQs are the key measurable characteristics of a product

or process that are important to the customer.

• Which tool is commonly used to identify the frequency of defects or

issues?

• Pareto Chart
• Control Chart
• Fishbone Diagram
• Histogram
• Pareto Chart 2 / 4

Rationale: Pareto charts use the 80/20 principle to identify the most

significant causes of defects, helping prioritize improvement efforts.

5. In a control chart, points outside the control limits indicate:

• Random variation
• Special cause variation
• Process capability
• Standard deviation
• Special cause variation

Rationale: Points outside the control limits signal that the process

may be affected by non-random factors, requiring investigation.

• Which of the following is a measure of process capability?
• Cp and Cpk
• Mean and Median
• Standard Deviation and Variance
• P-Value and T-Statistic
• Cp and Cpk

Rationale: Cp measures process potential, while Cpk measures how

centered the process is relative to specification limits.

• What is the primary goal of the Define phase in DMAIC?
• Identify root causes
• Establish process baseline
• Define the problem, goals, and project scope
• Implement control measures 3 / 4

• Define the problem, goals, and project scope

Rationale: The Define phase focuses on understanding the problem,

project scope, and objectives, including customer requirements.

• Which of the following is a Six Sigma quality level?
• 2 Sigma
• 4 Sigma
• 6 Sigma
• 8 Sigma
• 6 Sigma

Rationale: Six Sigma methodology aims for a defect rate of no more

than 3.4 defects per million opportunities, equivalent to a 6 Sigma quality level.

• In hypothesis testing, what is the null hypothesis?
• The statement being tested, assumed false
• The statement being tested, assumed true
• The alternative hypothesis
• The probability of error
• The statement being tested, assumed true

Rationale: The null hypothesis represents no effect or no difference

and is the baseline assumption in statistical testing.

• What type of data is represented by numbers that can be

counted and have a natural order?

• Nominal
• / 4