Lean Six Sigma Green Belt Certification
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. During which phase of the DMAIC methodology is a project charter
developed and approved? A) Measure B) Analyze C) Define D) Improve C)
Define Rationale: The project charter is the foundational document
created during the Define phase. It establishes the problem statement,
goal statement, project scope, team members, and timeline, securing
formal authorization from stakeholders and sponsors to proceed before
any data collection or analysis begins.
2. Which of the following tools is primarily used to identify and map all
stakeholders affected by a process improvement project? A) RACI Matrix B)
Fishbone Diagram C) FMEA D) Scatter Plot A) RACI Matrix Rationale: A RACI
matrix (Responsible, Accountable, Consulted, Informed) is highly effective
during the early stages of a project to clearly delineate stakeholder roles,
responsibilities, and involvement levels, ensuring smooth communication
and change management.
3. What does the "S" in a SIPOC diagram stand for? A) Standard B) Supplier C)
Specifications D) Scope B) Supplier Rationale: SIPOC stands for Suppliers,
Inputs, Process, Outputs, and Customers. It is a high-level process
mapping tool used in the Define phase to understand the boundaries and
components of a process from end to end.
4. A process has a specification limit of 50 +/- 5. The actual process mean is
50, and the standard deviation is 1.67. What is the approximate Cp value of
, this process? A) 0.50 B) 1.00 C) 1.33 D) 2.00 B) 1.00 Rationale: The process
capability index Cp is calculated as (Upper Specification Limit - Lower
Specification Limit) / (6 * standard deviation). Here, USL = 55, LSL = 45, so
the tolerance is 10. Dividing 10 by (6 * 1.67), which is approximately 10,
yields a Cp of 1.00.
5. Which type of waste (Muda) involves moving products or materials more
than necessary within a facility? A) Motion B) Transport C) Overprocessing
D) Inventory B) Transport Rationale: Transport refers explicitly to the
unnecessary movement of materials, parts, or finished goods between
processes or locations, whereas Motion refers specifically to the
unnecessary physical movement of workers or machinery.
6. What is the primary focus of the Lean methodology? A) Reducing process
variation B) Maximizing customer specifications C) Eliminating waste and
improving flow D) Lowering the cost of raw materials C) Eliminating waste
and improving flow Rationale: Lean centers on the systematic elimination
of non-value-added activities (waste) to maximize velocity and create
smooth, continuous flow through the value stream, whereas Six Sigma
primarily targets the reduction of variation.
7. In a normal distribution, approximately what percentage of data points fall
within +/- 2 standard deviations of the mean? A) 68.27% B) 95.45% C)
99.73% D) 99.99% B) 95.45% Rationale: According to the empirical rule for
a normal distribution, roughly 68% of the data falls within one standard
deviation, 95.45% falls within two standard deviations, and 99.73% falls
within three standard deviations of the process mean.
8. Which lean tool uses visual cues to signal when a process or station needs
more inventory or production capacity? A) Poka-Yoke B) Kanban C) Andon
D) Heijunka B) Kanban Rationale: Kanban is a pull-based visual scheduling
system that uses cards, bins, or digital signals to control production and
inventory flow, ensuring that upstream processes only produce items
when signaled by downstream consumption.
, 9. What type of data measures attributes or characteristics that can be
counted but not broken down into infinitely smaller increments? A)
Continuous Data B) Discrete Data C) Ratio Data D) Interval Data B) Discrete
Data Rationale: Discrete or attribute data consists of distinct, countable
values (such as the number of defects, pass/fail counts, or categories) that
cannot meaningfully be divided into fractional units, unlike continuous
data which can take any value along a scale.
10.A Six Sigma process allows for how many Defects Per Million Opportunities
(DPMO)? A) 2.7 B) 3.4 C) 4.5 D) 6.0 B) 3.4 Rationale: By definition, a Six
Sigma level of quality corresponds to 3.4 defects per million opportunities
when accounting for a historical and empirical 1.5-sigma shift in the
process mean over the long term.
11.Which tool is used during the Analyze phase to systematically explore the
underlying root causes of an event by asking sequential investigative
questions? A) 5 Whys B) Check Sheet C) Force Field Analysis D) Visual
Management A) 5 Whys Rationale: The 5 Whys technique is an iterative
interrogative method used to drill down through layers of symptoms to
find the true root cause of a defect or problem by repeatedly asking
"Why" an issue occurred until a systemic cause is uncovered.
12.What does a Value Stream Map (VSM) display that a standard cross-
functional deployment flowchart usually does not? A) Departmental
boundaries B) Material and information flow with cycle times C) The names
of process operators D) Project financial projections B) Material and
information flow with cycle times Rationale: A Value Stream Map
uniquely incorporates both the physical flow of materials and the
corresponding flow of information alongside key metrics like cycle time,
changeover time, and inventory levels to distinguish value-added from
non-value-added time.
13.Which of the following charts is most appropriate for monitoring the
number of defects per unit when the subgroup size varies? A) c chart B) u
chart C) p chart D) np chart B) u chart Rationale: The u chart tracks the
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. During which phase of the DMAIC methodology is a project charter
developed and approved? A) Measure B) Analyze C) Define D) Improve C)
Define Rationale: The project charter is the foundational document
created during the Define phase. It establishes the problem statement,
goal statement, project scope, team members, and timeline, securing
formal authorization from stakeholders and sponsors to proceed before
any data collection or analysis begins.
2. Which of the following tools is primarily used to identify and map all
stakeholders affected by a process improvement project? A) RACI Matrix B)
Fishbone Diagram C) FMEA D) Scatter Plot A) RACI Matrix Rationale: A RACI
matrix (Responsible, Accountable, Consulted, Informed) is highly effective
during the early stages of a project to clearly delineate stakeholder roles,
responsibilities, and involvement levels, ensuring smooth communication
and change management.
3. What does the "S" in a SIPOC diagram stand for? A) Standard B) Supplier C)
Specifications D) Scope B) Supplier Rationale: SIPOC stands for Suppliers,
Inputs, Process, Outputs, and Customers. It is a high-level process
mapping tool used in the Define phase to understand the boundaries and
components of a process from end to end.
4. A process has a specification limit of 50 +/- 5. The actual process mean is
50, and the standard deviation is 1.67. What is the approximate Cp value of
, this process? A) 0.50 B) 1.00 C) 1.33 D) 2.00 B) 1.00 Rationale: The process
capability index Cp is calculated as (Upper Specification Limit - Lower
Specification Limit) / (6 * standard deviation). Here, USL = 55, LSL = 45, so
the tolerance is 10. Dividing 10 by (6 * 1.67), which is approximately 10,
yields a Cp of 1.00.
5. Which type of waste (Muda) involves moving products or materials more
than necessary within a facility? A) Motion B) Transport C) Overprocessing
D) Inventory B) Transport Rationale: Transport refers explicitly to the
unnecessary movement of materials, parts, or finished goods between
processes or locations, whereas Motion refers specifically to the
unnecessary physical movement of workers or machinery.
6. What is the primary focus of the Lean methodology? A) Reducing process
variation B) Maximizing customer specifications C) Eliminating waste and
improving flow D) Lowering the cost of raw materials C) Eliminating waste
and improving flow Rationale: Lean centers on the systematic elimination
of non-value-added activities (waste) to maximize velocity and create
smooth, continuous flow through the value stream, whereas Six Sigma
primarily targets the reduction of variation.
7. In a normal distribution, approximately what percentage of data points fall
within +/- 2 standard deviations of the mean? A) 68.27% B) 95.45% C)
99.73% D) 99.99% B) 95.45% Rationale: According to the empirical rule for
a normal distribution, roughly 68% of the data falls within one standard
deviation, 95.45% falls within two standard deviations, and 99.73% falls
within three standard deviations of the process mean.
8. Which lean tool uses visual cues to signal when a process or station needs
more inventory or production capacity? A) Poka-Yoke B) Kanban C) Andon
D) Heijunka B) Kanban Rationale: Kanban is a pull-based visual scheduling
system that uses cards, bins, or digital signals to control production and
inventory flow, ensuring that upstream processes only produce items
when signaled by downstream consumption.
, 9. What type of data measures attributes or characteristics that can be
counted but not broken down into infinitely smaller increments? A)
Continuous Data B) Discrete Data C) Ratio Data D) Interval Data B) Discrete
Data Rationale: Discrete or attribute data consists of distinct, countable
values (such as the number of defects, pass/fail counts, or categories) that
cannot meaningfully be divided into fractional units, unlike continuous
data which can take any value along a scale.
10.A Six Sigma process allows for how many Defects Per Million Opportunities
(DPMO)? A) 2.7 B) 3.4 C) 4.5 D) 6.0 B) 3.4 Rationale: By definition, a Six
Sigma level of quality corresponds to 3.4 defects per million opportunities
when accounting for a historical and empirical 1.5-sigma shift in the
process mean over the long term.
11.Which tool is used during the Analyze phase to systematically explore the
underlying root causes of an event by asking sequential investigative
questions? A) 5 Whys B) Check Sheet C) Force Field Analysis D) Visual
Management A) 5 Whys Rationale: The 5 Whys technique is an iterative
interrogative method used to drill down through layers of symptoms to
find the true root cause of a defect or problem by repeatedly asking
"Why" an issue occurred until a systemic cause is uncovered.
12.What does a Value Stream Map (VSM) display that a standard cross-
functional deployment flowchart usually does not? A) Departmental
boundaries B) Material and information flow with cycle times C) The names
of process operators D) Project financial projections B) Material and
information flow with cycle times Rationale: A Value Stream Map
uniquely incorporates both the physical flow of materials and the
corresponding flow of information alongside key metrics like cycle time,
changeover time, and inventory levels to distinguish value-added from
non-value-added time.
13.Which of the following charts is most appropriate for monitoring the
number of defects per unit when the subgroup size varies? A) c chart B) u
chart C) p chart D) np chart B) u chart Rationale: The u chart tracks the
