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Free IASSC ICBB Practice Questions & Answers 2026 Part1 | Certified Lean Six Sigma Black Belt

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Question #1
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 #2
Kanban establishes a means of monitoring production, conveyance and delivery information such that efficient flow is established. The method used by Kanban is to require a _____________ before anything moves.
A. Sign-off
B. Signal
C. Bell to ring
D. Work order
View answer
Correct Answer: B
Question #3
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 #4
When a Belt Poka-Yokes a defect out of the process entirely then she should track the activity with a robust SPC system on the characteristic of interest in the defect as an early warning system.
A. rue
B. alse
View answer
Correct Answer: B
Question #5
Questions that can be best answered by a Visual Factory include all of these except _____________.
A. Are downtime issues easily noted?
B. Can extra inventory be seen easily?
C. Are unneeded tools or supplies easily noted?
D. Are setups optimized for lower scrap levels?
View answer
Correct Answer: D
Question #6
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 #7
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 #8
Which statement is NOT correct about the Fitted Line Plot shown here?
A. The independent variable is the reactant
B. If the reactant was 6 units, with 95 % confidence we would expect a minimum yield of 100 units
C. With at least 95% confidence, we can expect less than 10 units of Yield when the reactant is at a value of 1
D. A reactant value between 2 and 4 units yields around 20 to 40
E. When the reactant increases, the expected yield would increase
View answer
Correct Answer: D
Question #9
Relative to a Design of Experiments the term Collinear refers to variables being a ________________ of each other.
A. Linear combination
B. Directly parallel
C. Mirror image
D. None of the above
View answer
Correct Answer: A
Question #10
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 #11
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 #12
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 #13
Situations where standardized work needs to be incorporated include all of these except ________.
A. Machines continually operating to reduce the labor cost per piece
B. Lack of a system to assure proper inventory levels at repair stations
C. Changeover instructions incomplete
D. Process flow for the same product assembly taking various cycle time for completion
View answer
Correct Answer: A
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
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 #16
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 #17
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 #18
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 #19
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 #20
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 #21
When one speaks of 20% of something contributing 80% of the affect they are referring to what is known as the _________________.
A. alance Equation
B. hewhart Example
C. onnection Principle
D. areto Principle
View answer
Correct Answer: D
Question #22
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 #23
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 #24
Which statement(s) are incorrect for the Regression Analysis shown here? (Note: There are 2 correct answers).
A. The air-fuel ratio explains most of the TurbineOutput variation
B. The Regression explains over 98% of the process variation
C. This Multiple Linear Regression has three statistically significant independent variables
D. If the air-fuel ratio increases by 1, the TurbineOutput more than triples
E. The SteamExitTemp explains the most variation of the TurbineOutput
View answer
Correct Answer: DE
Question #25
A Full Factorial experiment using a 2 level 4 factor approach has been proposed to test the viability of an extrusion machine experiment. How many treatment combinations will this approach involve?
A.
B. 2
C. 4
D. 6
View answer
Correct Answer: D
Question #26
Which statement(s) are correct about the Regression shown here? (Note: There are 2 correct answers).
A. The dependent variable is the outside temperature
B. The relationship between outside temperature and number of customers per hour is a Linear Regression
C. The dashed lines indicate with 95% confidence where all of the process data should fall between
D. The dashed lines indicate with 95% confidence the estimate for the Quadratic Regression Line
E. The predicted number of customers per hour is close to 5 if the outside temperature is 10 deg C
View answer
Correct Answer: DE
Question #27
All the data points that represent the total set of information of interest is called the ________________ .
A. pread
B. ample
C. rame
D. opulation
View answer
Correct Answer: D
Question #28
Which statement is NOT correct about the Fitted Line Plot shown here?
A. The independent variable is the reactant
B. If the reactant was 6 units, with 95 % confidence we would expect a minimum yield of 100 units
C. With at least 95% confidence, we can expect less than 10 units of Yield when the reactant is at a value of 1
D. A reactant value between 2 and 4 units yields around 20 to 40
E. When the reactant increases, the expected yield would increase
View answer
Correct Answer: D
Question #29
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 #30
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 #31
Situations where standardized work needs to be incorporated include all of these except ________.
A. Machines continually operating to reduce the labor cost per piece
B. Lack of a system to assure proper inventory levels at repair stations
C. Changeover instructions incomplete
D. Process flow for the same product assembly taking various cycle time for completion
View answer
Correct Answer: A
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
It would be more likely than not for a Belt conducting a Regression Analysis to find that the__________________.
A. r2 value is smaller than the absolute value of r
B. Correlation Coefficient equals r2
C. Coefficient of Determination is less than r2
D. Correlation Coefficient equals r divided by 2
View answer
Correct Answer: A
Question #34
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 #35
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 #36
The Control Limits width varies if the sample size varies for which type of chart?
A. Charts
B. P Charts
C. bar-R Charts
D. ime Series Charts
View answer
Correct Answer: A
Question #37
What conclusion is most correct about the Experimental Design shown here with the response in the far right column?
A. No factor has enough statistical confidence greater than 95% to have an impact on the response rate
B. Constant, Adv and Bev are the only factors statistically affecting the response rate with 95% confidence or more
C. If the Adv is increased from the low level to the high level, the response rate increases
D. The response level is statistically concluded to only need the Adv and Bev factors set at the low level to get the largest response rate
E. This design does not have enough experimental runs to conclude anything as evidenced by the lack of P-values in the MINITABTM output
View answer
Correct Answer: D
Question #38
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 #39
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 #40
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 #41
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 #42
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 #43
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 #44
A Full Factorial experiment using a 3 level 3 factor approach has been proposed to test the viability of an extrusion machine experiment. How many treatment combinations will this approach involve?
A. 6
B. 9
C. 27
D. 54
View answer
Correct Answer: C
Question #45
Relative to a Design of Experiments the term __________ refers to variables being a linear combination of each other.
A. Mirror Image
B. Directly Parallel
C. Collinear
D. None of the above
View answer
Correct Answer: C
Question #46
When a Belt Poka-Yoke’s a defect out of the process entirely then she should track the activity with a robust SPC system on the characteristic of interest in the defect as an early warning system.
A. True
B. False
View answer
Correct Answer: B
Question #47
Since Normality is required if we intend to use the data collected as a predictive tool. To test for Normality of data we must determine if the P-value is ___________.
A. qual to 0
B. reater than 0
C. ess than 0
D. reater than 0
View answer
Correct Answer: D
Question #48
When a Belt Poka-Yoke’s a defect out of the process entirely then she should track the activity with a robust SPC system on the characteristic of interest in the defect as an early warning system.
A. True
B. False
View answer
Correct Answer: B
Question #49
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 #50
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

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