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Free IASSC ICBB Practice Questions & Answers 2026 Part4 | Certified Lean Six Sigma Black Belt

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Question #1
Special Cause Variation falls into which two categories?
A. atural & Unnatural
B. hort Term & Long Term
C. ssignable & Pattern
D. ttribute & Discreet
View answer
Correct Answer: C
Question #2
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 #3
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 #4
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 #5
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 #6
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 #7
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 #8
When doing Hypothesis Testing on Non-normal data Belts will use a_________________to compare more than two sample proportions to each other.
A. Z score Table
B. Sakami Table
C. Mean-to-Mode Analysis
D. Contingency Table
View answer
Correct Answer: C
Question #9
A ___________ is used primarily to track the stability of the average value of a metric of interest.
A. P Chart
B. bar-R Chart
C. -MR Chart
D. Chart
View answer
Correct Answer: B
Question #10
Much of the Six Sigma methodology is used to identify and remove causes for _____________ .
A. Process Variation
B. Material Costs
C. Excess Inventory
D. Lost Sales
View answer
Correct Answer: A
Question #11
If an experiment has 5 factors and no replicates for a 2-level Experimental Design with 16experimental runs which statement is incorrect?
A. he Experimental Design is half-fractional
B. he Main Effects are confounded with only 4-way interactions
C. he Main Effects for the 5 factors are not aliased or confounded but the 2-way interactions are confounded with the 3-way interactions
D. he experiment has 8 experimental runs with the first factor at the high level
View answer
Correct Answer: C
Question #12
An operator is measuring the distance between two points. Which is most likely to be influenced by the operator?
A. Precision of the measurement
B. Accuracy of the measurement
C. Calibration of the instrument
D. All of these answers are correct
View answer
Correct Answer: D
Question #13
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 #14
A statistical test or Hypothesis Test is performed to reject or fail to reject a stated hypothesis and it converts the Practical Problem into a Statistical Problem.
A. rue
B. alse
View answer
Correct Answer: A
Question #15
For a Normal Distribution as samples size increases the Range in Mean and Standard Deviation decrease relative to the Mean and Standard Deviation of the population.
A. True
B. False
View answer
Correct Answer: A
Question #16
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 #17
What conclusion is most correct about the Experimental Design shown here with the response in thefar right column?
A. o factor has enough statistical confidence greater than 95% to have an impact on the response rate
B. onstant, Adv and Bev are the only factors statistically affecting the response rate with 95% confidence or more
C. f the Adv is increased from the low level to the high level, the response rate increases
D. he 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. his 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 #18
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 #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
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 #21
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 #22
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 #23
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 #24
A Belt rearranged the location of the parts inventory for a rework station locating the most often used parts to be within hand reach of the repair person. This rearrangement resulted in quicker repair times by eliminating one of seven major elements of waste which is the Waste of __________.
A. nventory
B. otion
C. onveyance
D. aiting
View answer
Correct Answer: B
Question #25
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 #26
A Factorial Experiment based on a Level 2 Design with 6 factors would require 16 runs to fully assess the interactions.
A. True
B. False
View answer
Correct Answer: B
Question #27
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 #28
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 #29
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 #30
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 #31
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 #32
Which statement(s) are correct about the Pareto Chart shown here for the DOE analysis? (Note: There are 2 correct answers).
A. It is unknown from this graph how many factors were in the Experimental Design
B. The factors to keep in the mathematical model are E, D, DE, BD and B with an alpha risk equal to 2
C. The effects to keep in the mathematical model are E, D, DE, BD and B with an alpha risk equal to 0
D. The factors to keep in the mathematical model with a 5% alpha risk are BE, AB, A and AD
View answer
Correct Answer: AC
Question #33
How many experimental runs exist in a Full Factorial and fully randomized design for 4 factors with 2 replicates for the Corner Points and no Center Points? The factors in the experiment are only at2-levels.
A. 10
B. 32
C. 256
D. 64
View answer
Correct Answer: B
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
Which statement(s) are correct about the Factorial Plot shown here? (Note: There are 3 correct answers).
A. When the cutting speed increased from low to high level, the tool age increases
B. The coefficient of the metal hardness is positively related to the output of tool age
C. The coded coefficient is lower for cutting speed than the cutting angle related to the output of tool age
D. These plots prove a statistically significance factor with 95% confidence
E. These plots are an example of interaction plots
View answer
Correct Answer: ABC
Question #36
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 #37
How many experimental runs exist in a Full Factorial and fully randomized design for 4 factors with 2replicates for the Corner Points and no Center Points? The factors in the experiment are only at 2-levels.
A. 0
B. 2
C. 56
D. 4
View answer
Correct Answer: B
Question #38
Which statement(s) are correct about the Factorial Plot shown here? (Note: There are 3 correctanswers).
A. hen the cutting speed increased from low to high level, the tool age increases
B. he coefficient of the metal hardness is positively related to the output of tool age
C. he coded coefficient is lower for cutting speed than the cutting angle related to the output of tool age
D. hese plots prove a statistically significance factor with 95% confidence
E. hese plots are an example of interaction plots
View answer
Correct Answer: ABC
Question #39
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 #40
A kurtosis of -1,2754 indicates?
A. Platykurtic (flat with a short tail)
B. Leptokurtic (peaked with long tails)
C. Multi-modal (more than one distribution)
D. Kanban Model
View answer
Correct Answer: A
Question #41
Which of these items contribute to what is necessary for successful Kaizen events?
A. Analysis tools
B. Management support
C. Operator support
D. All of these answers are correct
View answer
Correct Answer: D
Question #42
Which statement(s) are correct about the Pareto Chart shown here for the DOE analysis? (Note: There are 2 correct answers).
A. It is unknown from this graph how many factors were in the Experimental Design
B. The factors to keep in the mathematical model are E, D, DE, BD and B with an alpha risk equal to 2
C. The effects to keep in the mathematical model are E, D, DE, BD and B with an alpha risk equal to 0
D. The factors to keep in the mathematical model with a 5% alpha risk are BE, AB, A and AD
View answer
Correct Answer: AC
Question #43
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 #44
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 #45
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 #46
Common and __________Cause Variation are the focus of Statistical Process Control.
A. Uncommon
B. Ordinary
C. Special
D. Selective
View answer
Correct Answer: C
Question #47
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 $4,200 in order to stay within budget. Using a sample of 35 first article components, a Mean of the new product upgrade price of $4,060, and a Standard Deviation of $98 was estimated. The Alternative Hypothesis in the above example is?
A. The Standard Deviation is equal to $300
B. The Mean is less than $4,320
C. The Mean is equal to $4,060
D. The Mean is less than $4,200
E. The Mean is greater than $ 4,200
View answer
Correct Answer: E
Question #48
A two-sample T-test does which of the following?
A. Compares the medians to determine if sample 1 is statistically difference from sample 2
B. Subtracts the mean of sample 1 from sample 2 and compares the difference to zero to determine if they are equal
C. Compares the means to determine if sample 1 is statistically difference from sample 2
D. test of the difference between two population medians
View answer
Correct Answer: C
Question #49
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 #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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