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Free IASSC ICBB Practice Questions & Answers 2026 Part3 | Certified Lean Six Sigma Black Belt

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Question #1
The relationship between a response variable and one or more independent variables is investigated and modeled by use of____________________.
A. X-Y Matrix
B. Baldridge Assessment
C. Analysis of Variance (ANOVA)
D. Critical X's Definition
View answer
Correct Answer: C
Question #2
A ___________ is used primarily to track the stability of the average value of a metric of interest.
A. NP Chart
B. Xbar-R Chart
C. I-MR Chart
D. C Chart
View answer
Correct Answer: B
Question #3
For the data set shown here which of these statements is/are true?
A. Hypothesis Testing of Means or Medians cannot be done since there are an unequal number of observations for the 3 samples
B. A Paired T-test would be applicable for comparing Grade B and Grade A since they follow each other in the data set
C. Grade A has the lowest sample Mean of the 3 samples
D. Grade A has a higher sample Mean than Grade B
View answer
Correct Answer: C
Question #4
A(n)_______________ is best used to compare a Machine 1 average quality characteristic to the same quality characteristic of Machine 2.
A. F test
B. 1-Sample t-test
C. 2-Sample t-test
D. ANOVA test
View answer
Correct Answer: C
Question #5
When a Belt decides to use written procedures and visual controls to improve the consistency of the tasks that must occur in the process he is improving he has utilized the ___________activity of 5S.
A. Sustaining
B. Sorting
C. Standardizing
D. Straightening
View answer
Correct Answer: C
Question #6
For the data set shown here which of these statements is/are true?
A. Hypothesis Testing of Means or Medians cannot be done since there are an unequal number of observations for the 3 samples
B. A Paired T-test would be applicable for comparing Grade B and Grade A since they follow each other in the data set
C. Grade A has the lowest sample Mean of the 3 samples
D. Grade A has a higher sample Mean than Grade B
View answer
Correct Answer: C
Question #7
As a means of measuring the effects on other areas of a process as a result of changes in the primary metric we also define and track ________________.
A. ertiary metrics
B. econdary metrics
C. arallel process metrics
D. ndustry standards
View answer
Correct Answer: B
Question #8
Following the completion of a LSS project the Belt not only creates a Control Plan he also develops a _____________ so those involved in the process know what to do when the critical metrics move out of spec.
A. esponse Plan
B. all List
C. hain-of-Command
D. efect Analysis Plan
View answer
Correct Answer: A
Question #9
Special Cause Variation falls into which two categories?
A. Natural & Unnatural
B. Short Term & Long Term
C. Assignable & Pattern
D. Attribute & Discreet
View answer
Correct Answer: C
Question #10
If a Six Sigma project was to reduce repair station inventory and the team found the inventory was creeping up over time which Lean tools should be considered in the Control Phase to reestablish and sustain the project success?
A. Review the Visual Factory to assure inventory in excess of desired visible
B. Improve the lighting to assure adequate visibility
C. Analyze data from supplier deliveries
D. Reword the standardized work instructions to use active verbs and not passive phrases
View answer
Correct Answer: A
Question #11
A Belt working in a supply chain environment has to make a decision to change suppliers of critical raw materials for a new product upgrade. The purchasing manager is depending on the Belt’s effort requiring that the average cost of an internal critical raw material component be less than or equal to $3,600 in order to stay within budget. Using a sample of 42 first article components, a Mean of the new product upgrade price of $3,200 and a Standard Deviation of $180 was estimated. Based on the data provided, the Z value for the data assuming a Normal Distribution is?
A. 1
B. 2
C. 4
D. 5
View answer
Correct Answer: B
Question #12
For the data set shown here which of these statements is/are true?
A. Hypothesis Testing of Means or Medians cannot be done since there are an unequal number of observations for the 3 samples
B. A Paired T-test would be applicable for comparing Grade B and Grade A since they follow each other in the data set
C. Grade A has the lowest sample Mean of the 3 samples
D. Grade A has a higher sample Mean than Grade B
View answer
Correct Answer: C
Question #13
Assessing process proportion as opposed to evaluating a process with respect to a set target can be done using which of these?
A. Process proportion equals some value range
B. Process proportion equals some desired value
C. Target is current
D. Proportion of the tail is equal
View answer
Correct Answer: B
Question #14
For the data shown here which statement(s) are true? (Note: There are 2 correct answers).
A. With 95% confidence, we cannot conclude if the samples are from three Normal Distributions
B. With greater than 95% confidence, we conclude the samples are from Non-normal Distributions
C. If we wanted to compare the Central Tendencies of these three samples we would use the one way ANOVA test
D. If we wanted to compare the Central Tendencies of these three samples we could use Mood’s Median test
View answer
Correct Answer: BD
Question #15
When we gather information for the Voice of the Business we are primarily interested in information concerning the _____________ of the business.
A. AAdvertising budget
B. BMarket share
C. CProfitability
D. DOwnership
View answer
Correct Answer: C
Question #16
Control Charts were developed by Dr. Shewhart to track data over time. To detect Special Cause variation the Control Charts use which of these?
A. Data shift analysis
B. Outlier analysis methods
C. Center Line and Control Limits
D. None of the above
View answer
Correct Answer: C
Question #17
Fractional Factorial designs are used to reduce the __________because the number of runs has been lowered.
A. Time and cost of experiments
B. Number of people involved
C. Number of data measurement points
D. Output summary
View answer
Correct Answer: A
Question #18
In a Fishbone Diagram the 6M’s stand for Methods, ____________, Machine, Man, Mother Nature and Materials.
A. Measurements
B. Merger
C. Management
D. Medical
View answer
Correct Answer: A
Question #19
A(n)_______________ is best used to compare a Machine 1 average quality characteristic to the same quality characteristic of Machine 2.
A. F test
B. 1-Sample t-test
C. 2-Sample t-test
D. ANOVA test
View answer
Correct Answer: C
Question #20
When a Belt conducts a Linear Correlation Analysis and finds that as an X increases the Y also increase then he has proven a ____________correlation.
A. Negative
B. Positive
C. Monomial
D. Single alignment
View answer
Correct Answer: B
Question #21
Following the completion of a LSS project the Belt not only creates a Control Plan he also develops a _____________so those involved in the process know what to do when the critical metrics move out of spec.
A. Response Plan
B. Call List
C. Chain-of-Command
D. Defect Analysis Plan
View answer
Correct Answer: A
Question #22
Kaizens or Kaikakus and Six Sigma projects are intended to create incremental process improvements versus breakthrough, significant improvements.
A. True
B. False
View answer
Correct Answer: B
Question #23
Special Cause Variation falls into which two categories?
A. Natural & Unnatural
B. Short Term & Long Term
C. Assignable & Pattern
D. Attribute & Discreet
View answer
Correct Answer: C
Question #24
If a Six Sigma project was to reduce repair station inventory and the team found the inventory was creeping up over time which Lean tools should be considered in the Control Phase to reestablish and sustain the project success?
A. Review the Visual Factory to assure inventory in excess of desired visible
B. Improve the lighting to assure adequate visibility
C. Analyze data from supplier deliveries
D. Reword the standardized work instructions to use active verbs and not passive phrases
View answer
Correct Answer: A
Question #25
SPC Charts are used extensively in different business and decision-making environments. In this example a vendor is being selected based on speed of delivery. Which of the conclusions would help you pick a vendor for your needs regarding lead-time of delivery from your vendors? (Note: There are 4 correct answers).
A. Vendor A with a much shorter lead time in delivery
B. Vendor B as it has a better consistency (lower variance) on lead time
C. Vendor B as Vendor A shows a situation out of control as shown in red
D. Vendor B as the Control Limits are much narrower than Vendor A
E. Vendor B with higher lead time, but a process with much narrower Control Limits
View answer
Correct Answer: BCDE
Question #26
If an experiment has 5 factors and no replicates for a 2-level Experimental Design with 16 experimental runs which statement is incorrect?
A. The Experimental Design is half-fractional
B. The Main Effects are confounded with only 4-way interactions
C. The Main Effects for the 5 factors are not aliased or confounded but the 2-way interactions are confounded with the 3-way interactions
D. The experiment has 8 experimental runs with the first factor at the high level
View answer
Correct Answer: C
Question #27
A(n)_______________ is best used to compare a Machine 1 average quality characteristic to the same quality characteristic of Machine 2.
A. F test
B. 1-Sample t-test
C. 2-Sample t-test
D. ANOVA test
View answer
Correct Answer: C
Question #28
The relationship between a response variable and one or more independent variables is investigated and modeled by use of____________________.
A. X-Y Matrix
B. Baldridge Assessment
C. Analysis of Variance (ANOVA)
D. Critical X's Definition
View answer
Correct Answer: C
Question #29
Appropriate measures means that measurements are ______________.
A. Representative
B. Sufficient
C. Contextual
D. Relevant
E. All of these answers are correct
View answer
Correct Answer: E
Question #30
Fractional Factorial, __________and Response Surface Method are types of planned experiments.
A. Multi-Vari Analysis
B. Baldridge Channels
C. One Factor at a Time or OFAT
D. Factorial Design
View answer
Correct Answer: D
Question #31
Sally and Sara sell flower pots at their garage sale. Martha motivates Rose mentioning that they will sell a minimum of 16 pots per day if the outside temperature exceeds 60o F. From a sample, whose population is assumed to follow a Normal Distribution, taken for 30 days at 60 degrees or more an average of 15.2 pots per day were sold with a Standard Deviation of 0.6 pots. What is the Z value for this sales process?
A. 0
B. 1
C. 1
D. 2
View answer
Correct Answer: C
Question #32
For the data set shown here which of these statements is/are true?
A. Hypothesis Testing of Means or Medians cannot be done since there are an unequal number of observations for the 3 samples
B. A Paired T-test would be applicable for comparing Grade B and Grade A since they follow each other in the data set
C. Grade A has the lowest sample Mean of the 3 samples
D. Grade A has a higher sample Mean than Grade B
View answer
Correct Answer: C
Question #33
Assessing process proportion as opposed to evaluating a process with respect to a set target can be done using which of these?
A. Process proportion equals some value range
B. Process proportion equals some desired value
C. Target is current
D. Proportion of the tail is equal
View answer
Correct Answer: B
Question #34
For the data set shown here which of these statements is/are true?
A. Hypothesis Testing of Means or Medians cannot be done since there are an unequal number of observations for the 3 samples
B. A Paired T-test would be applicable for comparing Grade B and Grade A since they follow each other in the data set
C. Grade A has the lowest sample Mean of the 3 samples
D. Grade A has a higher sample Mean than Grade B
View answer
Correct Answer: C
Question #35
A Belt working in a supply chain environment has to make a decision to change suppliers of critical raw materials for a new product upgrade. The purchasing manager is depending on the Belt’s effort requiring that the average cost of an internal critical raw material component be less than or equal to $3,600 in order to stay within budget. Using a sample of 42 first article components, a Mean of the new product upgrade price of $3,200 and a Standard Deviation of $180 was estimated. Based on the data provided, the Z value for the data assuming a Normal Distribution is?
A. 1
B. 2
C. 4
D. 5
View answer
Correct Answer: B
Question #36
When a Belt properly analyzes the results of an experiment he must examine the Residuals in expectation of finding all of the following except .
A. Some Residuals higher than others
B. Some Residuals lower than others
C. All Residuals within 2 Standard Deviations of the Mean
D. Residuals will represent a Linear Regression
View answer
Correct Answer: D
Question #37
A(n)_______________ is best used to compare a Machine 1 average quality characteristic to the same quality characteristic of Machine 2.
A. F test
B. 1-Sample t-test
C. 2-Sample t-test
D. ANOVA test
View answer
Correct Answer: C
Question #38
Upon completion and validation of an improvement to a process a Belt and the Project Team create aControl Plan that contains which of these?
A. tandard operating work description of the process change
B. escription of the monitoring system in place to assure continued compliance
C. ummary of the targeted critical metrics for process performance measurement
D. ll of the above
View answer
Correct Answer: D
Question #39
A ___________ is used primarily to track the stability of the average value of a metric of interest.
A. Chart
B. P Chart
C. -MR Chart
D. bar-R Chart
View answer
Correct Answer: D
Question #40
A _______is used primarily to track the stability of the average value of a metric of interest.
A. NP Chart
B. Xbar-R Chart
C. I-MR Chart
D. C Chart
View answer
Correct Answer: B
Question #41
The Lean toolbox includes all of these items except ____________.
A. Mistake Proofing
B. Visual Factory
C. Design of Experiments
D. Inventory Management
View answer
Correct Answer: C
Question #42
When analyzing the behavior of our process to assess customer satisfaction we are concerned about both the variation such that it stays within the spec limits and how well the Mean is __________________ the process requirements.
A. Balanced against
B. Over and above
C. Twice as great as
D. Centered relative to
View answer
Correct Answer: D
Question #43
For the data shown here which statement(s) are true? (Note: There are 2 correct answers).
A. With 95% confidence, we cannot conclude if the samples are from three Normal Distributions
B. With greater than 95% confidence, we conclude the samples are from Non-normal Distributions
C. If we wanted to compare the Central Tendencies of these three samples we would use the one way ANOVA test
D. If we wanted to compare the Central Tendencies of these three samples we could use Mood’s Median test
View answer
Correct Answer: BD
Question #44
For her injection molding project a Belt needed to track the percentage of defectives of a particular sample set so she used a ___________to display the data?
A. Individual Chart
B. C Chart
C. Xbar Chart
D. P Chart
View answer
Correct Answer: D
Question #45
Which statement(s) are most correct for the Regression Analysis shown here?
A. The Regression explains 50
B. The air-fuel ratio explains most of the TurbineOutput variation
C. This Simple Linear Regression explains 98+% of the process variation
D. This Multiple Linear Regression has four statistically significant independent variables
View answer
Correct Answer: B
Question #46
Assessing process proportion as opposed to evaluating a process with respect to a set target can be done using which of these?
A. Process proportion equals some value range
B. Process proportion equals some desired value
C. Target is current
D. Proportion of the tail is equal
View answer
Correct Answer: B
Question #47
Assessing process proportion as opposed to evaluating a process with respect to a set target can be done using which of these?
A. Process proportion equals some value range
B. Process proportion equals some desired value
C. Target is current
D. Proportion of the tail is equal
View answer
Correct Answer: B
Question #48
Which of these graphs demonstrates conditions which would be sufficient to enable OCAP for the process?
A. bar Chart
B. ime Series Chart
C. either
D. oth
View answer
Correct Answer: A
Question #49
Fractional Factorial, __________and Response Surface Method are types of planned experiments.
A. Multi-Vari Analysis
B. Baldridge Channels
C. One Factor at a Time or OFAT
D. Factorial Design
View answer
Correct Answer: D
Question #50
For the data shown here which statement(s) are true? (Note: There are 2 correct answers).
A. With 95% confidence, we cannot conclude if the samples are from three Normal Distributions
B. With greater than 95% confidence, we conclude the samples are from Non-normal Distributions
C. If we wanted to compare the Central Tendencies of these three samples we would use the one way ANOVA test
D. If we wanted to compare the Central Tendencies of these three samples we could use Mood’s Median test
View answer
Correct Answer: BD

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