IASSC LSSGB EXAM 2026 COMPLETE
QUESTIONS AND ANSWERS GRADED A+
⩥ Who should complete the control phase after the successful
completion and implementation of the first four phases of DMAIC?
A. The green belt alone; the project has been successfully completed.
B. The process owner alone; it is his responsibility to take the project
from here.
C. The process owner and the Green Belt together should complete the
control phase.
D. The complete team is the most desirable option. Answer: D. The
complete team is the most desirable option.
The control phase should be completed by the entire team. Control is not
an insignificant phase of the DMAIC process. The green belt or the
process owner alone may not have the ability and knowledge to structure
the last control step. So option d is correct.
,⩥ To increase the power of the experiments, what is the best choice in
the hands of a Six Sigma team?
A. Increase Sample Size
B. Reduce Sample Size
C. Reduce Significance level
D. All of the above. Answer: A. Increase Sample Size
Options b and c are not serious considerations, and thus option d can be
ruled out. Conceptually, increase in sample size increases the possible
accuracy of the experiment, and thus an increase in power. So, option a
is the correct answer.
⩥ Hypothesis testing is usually done to:
A. Statistically validate if a sample mean belongs to the population
B. Statistically validate if means of two groups are the same or if they
are significantly different
C. Statistically validate if variances of two groups are the same or if they
are different.
D. All of the above. Answer: D. All of the above
,Statistically validate if a sample mean does belong to the population,
find if means of two groups are the same or if they are significantly
different, and validate if variances of two groups are the same or if they
are different. Option d is the correct answer.
⩥ What is the concept behind PDCA?
A. The Deming/Shewhart cycle
B. Process flow
C. Continuous improvement
D. Satisfying suppliers. Answer: C. Continuous Improvement
The key question phrase is "concept behind." Option b is inappropriate
and does not fit the question. Option a would be correct if the question
requested another name for PDCA. Answer option d could be one of the
number of potential positive outcomes of this activity. However, the
concept behind and objective of PDCA is that of continuous
improvement.
⩥ What are the six experiments called while performing one experiment
with five repetitions?
, A. Randomization
B. Replications
C. Planned grouping
D. Sequential. Answer: B. Replications
Repeated trials or replications are often conducted to estimate the pure
trial-to-trial experimental error so that lack of fit may be evaluated.
Randomization frees an experiment from the environment and other
biases. Sequential experiments are conducted one after another, not all at
the same time. Adjustments may be made in the experimentation based
upon the knowledge obtained. Almost any DOE contains planned
grouping. So answer option b is correct.
⩥ Which type of chart is used for small shifts in variation?
A. Xbar
B. p
C. c
D. CUSUM. Answer: D. CUSUM
The other charts are traditional control charts that are designed to
identify significant shifts in process variation, while the CUSUM chart is
designed to show small variation shifts
QUESTIONS AND ANSWERS GRADED A+
⩥ Who should complete the control phase after the successful
completion and implementation of the first four phases of DMAIC?
A. The green belt alone; the project has been successfully completed.
B. The process owner alone; it is his responsibility to take the project
from here.
C. The process owner and the Green Belt together should complete the
control phase.
D. The complete team is the most desirable option. Answer: D. The
complete team is the most desirable option.
The control phase should be completed by the entire team. Control is not
an insignificant phase of the DMAIC process. The green belt or the
process owner alone may not have the ability and knowledge to structure
the last control step. So option d is correct.
,⩥ To increase the power of the experiments, what is the best choice in
the hands of a Six Sigma team?
A. Increase Sample Size
B. Reduce Sample Size
C. Reduce Significance level
D. All of the above. Answer: A. Increase Sample Size
Options b and c are not serious considerations, and thus option d can be
ruled out. Conceptually, increase in sample size increases the possible
accuracy of the experiment, and thus an increase in power. So, option a
is the correct answer.
⩥ Hypothesis testing is usually done to:
A. Statistically validate if a sample mean belongs to the population
B. Statistically validate if means of two groups are the same or if they
are significantly different
C. Statistically validate if variances of two groups are the same or if they
are different.
D. All of the above. Answer: D. All of the above
,Statistically validate if a sample mean does belong to the population,
find if means of two groups are the same or if they are significantly
different, and validate if variances of two groups are the same or if they
are different. Option d is the correct answer.
⩥ What is the concept behind PDCA?
A. The Deming/Shewhart cycle
B. Process flow
C. Continuous improvement
D. Satisfying suppliers. Answer: C. Continuous Improvement
The key question phrase is "concept behind." Option b is inappropriate
and does not fit the question. Option a would be correct if the question
requested another name for PDCA. Answer option d could be one of the
number of potential positive outcomes of this activity. However, the
concept behind and objective of PDCA is that of continuous
improvement.
⩥ What are the six experiments called while performing one experiment
with five repetitions?
, A. Randomization
B. Replications
C. Planned grouping
D. Sequential. Answer: B. Replications
Repeated trials or replications are often conducted to estimate the pure
trial-to-trial experimental error so that lack of fit may be evaluated.
Randomization frees an experiment from the environment and other
biases. Sequential experiments are conducted one after another, not all at
the same time. Adjustments may be made in the experimentation based
upon the knowledge obtained. Almost any DOE contains planned
grouping. So answer option b is correct.
⩥ Which type of chart is used for small shifts in variation?
A. Xbar
B. p
C. c
D. CUSUM. Answer: D. CUSUM
The other charts are traditional control charts that are designed to
identify significant shifts in process variation, while the CUSUM chart is
designed to show small variation shifts
