IASSC LSSGB EXAMINATION TEST 2026
COMPLETE STUDY GUIDE WITH ANSWERS
⩥ To increase the power of experiments, what is the best option in the
hands of the Six Sigma team? Answer: Increase sample size
⩥ Which of the techniques used in DOE helps you in eliminating errors
due to nuisance factors? Answer: Blocking
⩥ Hypothesis testing is usually done to: Answer: 1) Statistically validate
if the sample mean belongs to the population, 2) statistically validate if
means of two groups are the same or if they are significantly different,
and 3) statistically validate if variances of two groups are the same or if
they are different.
⩥ What is the concept behind PDCA? Answer: Continuous improvement
⩥ What are the experiments called while performing one experiment
with five repetitions? Answer: Replications
⩥ Which type of chart is used for small shifts in variation? Answer:
CUSUM
,⩥ What are the distinct types of variation that are displayed in control
charts? Answer: Chance (common or random) and assignable (special)
⩥ Which of the following is an advantage of the production of a product
in large lots? Answer: Machine efficiencies
⩥ A sample is to a statistic as a population value is to a: Answer:
Parameter
⩥ A calculation for reproducibility results in a value of 0 (zero), while
repeatability yields a positive number. Without any other considerations,
what conclusion can be made regarding the reproducibility result?
Answer: A reproducibility of zero means there is no operator effect on
this measurement.
⩥ The average number of major storms in a city is 2 per year. What is
the probability that exactly 3 storms will hit next year? Answer: 0.180 or
18%
⩥ Why are scatter diagrams useful in problem-solving? Answer: They
show relationships between variables.
⩥ The advantage of using the modern designed method of
experimentation, rather than the classical OFAT, is that: Answer: Fewer
terms and measurements are needed for valid and useful information.
,⩥ What does ANOVA stand for? Answer: Analysis of variance
⩥ Which quality tool would not be expected to be used during the results
confirmation stage of a problem solution? Answer: Flow chart
Use a process flow chart in the Define and Measure stage.
⩥ If 6 consecutive samples were taken from a process and precisely
measured, you can still expect differences. What type of variation would
be the most difficult one to determine? Answer: Lot-to-lot variation
⩥ Which of the following inference tests does NOT require the
knowledge of a test or population variance? Answer: Chi-square test
⩥ Which of the following is the LEAST likely candidate to assist in the
problem definition stage of Six Sigma? Answer: Control charts
Control charts are used in the Measure and Control phases. Remember:
The process must first be brought into statistical control by detecting and
acting upon special causes of variation. Then its performance is
predictable, and its capability to meet customer expectations can be
assessed (Cp and Cpk), which is done in the Measure phase.
, ⩥ What is the name of the condition if you are running a 7x4 fractional
experiment, and you know factors A, B, C, D, and E are independent of
each other, but you suspect factors F and G are not independent. You
conducted a small sub-experiment and discovered a high correlation
between factors F and G. Answer: Collinearity
⩥ If P(A) is 0.6 and P(B) is 0.5 and the probability of either event
happening is 0.85, what is the probability of both the events occurring?
Answer: 0.25 (additive rule)
⩥ A process has a high variability and an off-centered mean. What is the
first action the team needs to take? Answer: Center the mean
⩥ What is the use of scatter diagrams? Answer: Display correlation
⩥ Five samples are drawn out of a population of 200, with each sample
being of size 5. The sample means are 2, 2.5, 3, 2.6, and 4. What is the
population mean? Answer: 2.8
⩥ In the IT sector, time and effort spent in testing the software, fixing
bugs, and retesting would be considered as what type of waste? Answer:
Defects
COMPLETE STUDY GUIDE WITH ANSWERS
⩥ To increase the power of experiments, what is the best option in the
hands of the Six Sigma team? Answer: Increase sample size
⩥ Which of the techniques used in DOE helps you in eliminating errors
due to nuisance factors? Answer: Blocking
⩥ Hypothesis testing is usually done to: Answer: 1) Statistically validate
if the sample mean belongs to the population, 2) statistically validate if
means of two groups are the same or if they are significantly different,
and 3) statistically validate if variances of two groups are the same or if
they are different.
⩥ What is the concept behind PDCA? Answer: Continuous improvement
⩥ What are the experiments called while performing one experiment
with five repetitions? Answer: Replications
⩥ Which type of chart is used for small shifts in variation? Answer:
CUSUM
,⩥ What are the distinct types of variation that are displayed in control
charts? Answer: Chance (common or random) and assignable (special)
⩥ Which of the following is an advantage of the production of a product
in large lots? Answer: Machine efficiencies
⩥ A sample is to a statistic as a population value is to a: Answer:
Parameter
⩥ A calculation for reproducibility results in a value of 0 (zero), while
repeatability yields a positive number. Without any other considerations,
what conclusion can be made regarding the reproducibility result?
Answer: A reproducibility of zero means there is no operator effect on
this measurement.
⩥ The average number of major storms in a city is 2 per year. What is
the probability that exactly 3 storms will hit next year? Answer: 0.180 or
18%
⩥ Why are scatter diagrams useful in problem-solving? Answer: They
show relationships between variables.
⩥ The advantage of using the modern designed method of
experimentation, rather than the classical OFAT, is that: Answer: Fewer
terms and measurements are needed for valid and useful information.
,⩥ What does ANOVA stand for? Answer: Analysis of variance
⩥ Which quality tool would not be expected to be used during the results
confirmation stage of a problem solution? Answer: Flow chart
Use a process flow chart in the Define and Measure stage.
⩥ If 6 consecutive samples were taken from a process and precisely
measured, you can still expect differences. What type of variation would
be the most difficult one to determine? Answer: Lot-to-lot variation
⩥ Which of the following inference tests does NOT require the
knowledge of a test or population variance? Answer: Chi-square test
⩥ Which of the following is the LEAST likely candidate to assist in the
problem definition stage of Six Sigma? Answer: Control charts
Control charts are used in the Measure and Control phases. Remember:
The process must first be brought into statistical control by detecting and
acting upon special causes of variation. Then its performance is
predictable, and its capability to meet customer expectations can be
assessed (Cp and Cpk), which is done in the Measure phase.
, ⩥ What is the name of the condition if you are running a 7x4 fractional
experiment, and you know factors A, B, C, D, and E are independent of
each other, but you suspect factors F and G are not independent. You
conducted a small sub-experiment and discovered a high correlation
between factors F and G. Answer: Collinearity
⩥ If P(A) is 0.6 and P(B) is 0.5 and the probability of either event
happening is 0.85, what is the probability of both the events occurring?
Answer: 0.25 (additive rule)
⩥ A process has a high variability and an off-centered mean. What is the
first action the team needs to take? Answer: Center the mean
⩥ What is the use of scatter diagrams? Answer: Display correlation
⩥ Five samples are drawn out of a population of 200, with each sample
being of size 5. The sample means are 2, 2.5, 3, 2.6, and 4. What is the
population mean? Answer: 2.8
⩥ In the IT sector, time and effort spent in testing the software, fixing
bugs, and retesting would be considered as what type of waste? Answer:
Defects
