LEAN SIX SIGMA GREEN BELT EXAM PRACTICE QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALE
Q&A INSTANT DOWNLOAD PDF.
130 QUESTIONS
TABLE OF CONTENTS
# TOPIC
1 Apply DMAIC phases to complex process improvement scenarios
2 Select and interpret appropriate statistical tools for process analysis
3 Evaluate measurement system capability and process performance
4 Integrate lean principles with Six Sigma methodologies for waste reduction
5 Lean Six Sigma Green Belt Exam Practice Questions And Correct Answers
6 Verified Answers
7 Plus Rationale Q&A Instant Download Pdf.
8 Foundations of Lean Six Sigma Green Belt
9 Applied Lean Six Sigma Green Belt
10 Advanced Lean Six Sigma Green Belt
11 Lean Six Sigma Green Belt Review
Page 1
,Q1 APPLY DMAIC PHASES TO COMPLEX PROCESS IMPROVEMENT SCENARIOS
In a manufacturing process, a control chart for individual measurements (I-MR) is
used. The moving range (MR) chart shows a point above the upper control limit.
Which interpretation is most appropriate?
A. The process mean has shifted, requiring recalculation of control limits.
B. The process is out of control, but the mean may still be stable. CORRECT
C. The process is out of control, and the mean has shifted.
D. The process is in control; the point is a false alarm.
RATIONALE: A point above the UCL on the MR chart indicates an increase in short-term
variation, not necessarily a mean shift. The mean may be stable; investigation is needed. Option
A is incorrect because limits are not recalculated without a special cause. Option C overstates,
and D is a false assumption.
Q2 APPLY DMAIC PHASES TO COMPLEX PROCESS IMPROVEMENT SCENARIOS
A Green Belt is analyzing a process with a Cpk of 0.8 and a Cp of 1.5. Which
conclusion is most defensible?
A. The process is centered, but variation is too high.
B. The process is off-center, and variation is also excessive.
C. The process is off-center, but variation is acceptable relative to specifications. CORRECT
D. The process is centered, and variation is acceptable.
RATIONALE: Cp > 1.0 indicates potential capability if centered, but Cpk < 1.0 indicates the
process is off-center. Since Cp is high, variation is not excessive; the issue is centering. Thus, C
is correct.
Page 2
,Q3 APPLY DMAIC PHASES TO COMPLEX PROCESS IMPROVEMENT SCENARIOS
In a regression analysis, the residuals show a funnel-shaped pattern when plotted
against fitted values. Which assumption is violated?
A. Linearity
B. Independence
C. Constant variance (homoscedasticity) CORRECT
D. Normality of residuals
RATIONALE: A funnel pattern indicates that the variance of residuals changes with the level of
the fitted values, violating homoscedasticity. Linearity and independence are not directly
indicated; normality is assessed via histograms or normal probability plots.
Q4 APPLY DMAIC PHASES TO COMPLEX PROCESS IMPROVEMENT SCENARIOS
A process improvement team uses a 2^k factorial design with 3 factors and 2
center points. The total number of runs is 10. Which statement about the design is
correct?
A. The design is saturated; no degrees of freedom remain for error estimation.
B. The design has 3 degrees of freedom for pure error from the center points. CORRECT
C. The design cannot estimate interactions because of the center points.
D. The design has 5 degrees of freedom for error, including center points and replication.
RATIONALE: The 2^3 factorial has 8 runs plus 2 center points = 10 runs. Center points provide
an estimate of pure error with 1 degree of freedom (2 points - 1). The factorial runs are not
replicated, so no pure error from them. Thus, B is correct; A is false because there is some error
estimate; C is false because center points do not affect interaction estimation; D is incorrect
because only 1 df for pure error.
Page 3
, Q5 APPLY DMAIC PHASES TO COMPLEX PROCESS IMPROVEMENT SCENARIOS
A measurement system analysis (MSA) yields a %GRR of 12%. Which action is
most appropriate?
A. The measurement system is acceptable for process improvement but not for release
decisions. CORRECT
B. The measurement system is not acceptable; immediate recalibration is required.
C. The measurement system is acceptable for all applications.
D. The measurement system is borderline; further investigation is needed before acceptance.
RATIONALE: According to AIAG guidelines, %GRR < 10% is generally acceptable; 10-30% is
conditionally acceptable depending on application; >30% is unacceptable. 12% is in the
conditional range, so it may be acceptable for improvement but not for release. Thus, A is
correct.
Q6 APPLY DMAIC PHASES TO COMPLEX PROCESS IMPROVEMENT SCENARIOS
A process has a sigma level of 4.5 (with 1.5 sigma shift). What is the approximate
defects per million opportunities (DPMO)?
A. 3.4
B. 233
C. 1350 CORRECT
D. 6210
RATIONALE: A 4.5 sigma level (with shift) corresponds to approximately 3.4 DPMO for 6 sigma,
but for 4.5 sigma it is about 1350 DPMO. This is a standard conversion from the sigma table.
Page 4
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALE
Q&A INSTANT DOWNLOAD PDF.
130 QUESTIONS
TABLE OF CONTENTS
# TOPIC
1 Apply DMAIC phases to complex process improvement scenarios
2 Select and interpret appropriate statistical tools for process analysis
3 Evaluate measurement system capability and process performance
4 Integrate lean principles with Six Sigma methodologies for waste reduction
5 Lean Six Sigma Green Belt Exam Practice Questions And Correct Answers
6 Verified Answers
7 Plus Rationale Q&A Instant Download Pdf.
8 Foundations of Lean Six Sigma Green Belt
9 Applied Lean Six Sigma Green Belt
10 Advanced Lean Six Sigma Green Belt
11 Lean Six Sigma Green Belt Review
Page 1
,Q1 APPLY DMAIC PHASES TO COMPLEX PROCESS IMPROVEMENT SCENARIOS
In a manufacturing process, a control chart for individual measurements (I-MR) is
used. The moving range (MR) chart shows a point above the upper control limit.
Which interpretation is most appropriate?
A. The process mean has shifted, requiring recalculation of control limits.
B. The process is out of control, but the mean may still be stable. CORRECT
C. The process is out of control, and the mean has shifted.
D. The process is in control; the point is a false alarm.
RATIONALE: A point above the UCL on the MR chart indicates an increase in short-term
variation, not necessarily a mean shift. The mean may be stable; investigation is needed. Option
A is incorrect because limits are not recalculated without a special cause. Option C overstates,
and D is a false assumption.
Q2 APPLY DMAIC PHASES TO COMPLEX PROCESS IMPROVEMENT SCENARIOS
A Green Belt is analyzing a process with a Cpk of 0.8 and a Cp of 1.5. Which
conclusion is most defensible?
A. The process is centered, but variation is too high.
B. The process is off-center, and variation is also excessive.
C. The process is off-center, but variation is acceptable relative to specifications. CORRECT
D. The process is centered, and variation is acceptable.
RATIONALE: Cp > 1.0 indicates potential capability if centered, but Cpk < 1.0 indicates the
process is off-center. Since Cp is high, variation is not excessive; the issue is centering. Thus, C
is correct.
Page 2
,Q3 APPLY DMAIC PHASES TO COMPLEX PROCESS IMPROVEMENT SCENARIOS
In a regression analysis, the residuals show a funnel-shaped pattern when plotted
against fitted values. Which assumption is violated?
A. Linearity
B. Independence
C. Constant variance (homoscedasticity) CORRECT
D. Normality of residuals
RATIONALE: A funnel pattern indicates that the variance of residuals changes with the level of
the fitted values, violating homoscedasticity. Linearity and independence are not directly
indicated; normality is assessed via histograms or normal probability plots.
Q4 APPLY DMAIC PHASES TO COMPLEX PROCESS IMPROVEMENT SCENARIOS
A process improvement team uses a 2^k factorial design with 3 factors and 2
center points. The total number of runs is 10. Which statement about the design is
correct?
A. The design is saturated; no degrees of freedom remain for error estimation.
B. The design has 3 degrees of freedom for pure error from the center points. CORRECT
C. The design cannot estimate interactions because of the center points.
D. The design has 5 degrees of freedom for error, including center points and replication.
RATIONALE: The 2^3 factorial has 8 runs plus 2 center points = 10 runs. Center points provide
an estimate of pure error with 1 degree of freedom (2 points - 1). The factorial runs are not
replicated, so no pure error from them. Thus, B is correct; A is false because there is some error
estimate; C is false because center points do not affect interaction estimation; D is incorrect
because only 1 df for pure error.
Page 3
, Q5 APPLY DMAIC PHASES TO COMPLEX PROCESS IMPROVEMENT SCENARIOS
A measurement system analysis (MSA) yields a %GRR of 12%. Which action is
most appropriate?
A. The measurement system is acceptable for process improvement but not for release
decisions. CORRECT
B. The measurement system is not acceptable; immediate recalibration is required.
C. The measurement system is acceptable for all applications.
D. The measurement system is borderline; further investigation is needed before acceptance.
RATIONALE: According to AIAG guidelines, %GRR < 10% is generally acceptable; 10-30% is
conditionally acceptable depending on application; >30% is unacceptable. 12% is in the
conditional range, so it may be acceptable for improvement but not for release. Thus, A is
correct.
Q6 APPLY DMAIC PHASES TO COMPLEX PROCESS IMPROVEMENT SCENARIOS
A process has a sigma level of 4.5 (with 1.5 sigma shift). What is the approximate
defects per million opportunities (DPMO)?
A. 3.4
B. 233
C. 1350 CORRECT
D. 6210
RATIONALE: A 4.5 sigma level (with shift) corresponds to approximately 3.4 DPMO for 6 sigma,
but for 4.5 sigma it is about 1350 DPMO. This is a standard conversion from the sigma table.
Page 4
