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Free IASSC ICBB Practice Questions & Answers 2026 Part5 | Certified Lean Six Sigma Black Belt

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Question #1
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 $3,800 in order to stay within budget. Using a sample of 38 first article components, a Mean of the new product upgrade price of $3,680, and a Standard Deviation of $120 was estimated. In order to increase the Long Term Z value to 5, what is the maximum long term variation in pricing the Belt can accept for his upgraded critical raw material component?
A. $6
B. $12
C. $24
D. $48
View answer
Correct Answer: C
Question #2
Cost of Poor Quality (COPQ) can be classified as Visible Costs and Hidden Costs. Which of these items is a Visible Cost?
A. Lost Customer Loyalty
B. Time Value of Money
C. Returns
D. Late Delivery
View answer
Correct Answer: C
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
Which statement(s) are correct about the Pareto Chart shown here for the DOE analysis? (Note:There are 2 correct answers).
A. t is unknown from this graph how many factors were in the Experimental Design
B. he factors to keep in the mathematical model are E, D, DE, BD and B with an alpha risk equal to 2
C. he effects to keep in the mathematical model are E, D, DE, BD and B with an alpha risk equal to 0
D. he factors to keep in the mathematical model with a 5% alpha risk are BE, AB, A and AD
View answer
Correct Answer: AC
Question #5
Range Charts are the technique used to determine if ______________ are occurring within the subgroups of the SPC Charts.
A. Common Causes
B. Special inspections
C. Unnatural forces
D. Special Causes
View answer
Correct Answer: D
Question #6
The Greek letter ''sigma'' is used by mathematicians to signify _____________.
A. Curve Width
B. Numerical Average
C. Standard Deviation
D. Data Spread
View answer
Correct Answer: C
Question #7
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 #8
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 #9
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 $3,800 in order to stay within budget. Using a sample of 38 first article components, a Mean of the new product upgrade price of $3,680, and a Standard Deviation of $120 was estimated. In order to increase the Long Term Z value to 5, what is the maximum long term variation in pricing the Belt can accept for his upgraded critical raw material component?
A. $6
B. $12
C. $24
D. $48
View answer
Correct Answer: C
Question #10
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 #11
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 #12
If a Belt needed to model the data for the number of weaves in section of carpet fabric she would use the _____________ Distribution approach.
A. Poisson
B. Extended
C. Exponential
D. Weibull
View answer
Correct Answer: A
Question #13
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. ndividual Chart
B. Chart
C. bar Chart
D. Chart
View answer
Correct Answer: D
Question #14
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 #15
Common and ______________ Cause Variation are the focus of Statistical Process Control.
A. ncommon
B. rdinary
C. pecial
D. elective
View answer
Correct Answer: C
Question #16
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 #17
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 #18
For a process having an average throughput of 7,200 units per hour, what is the average Cycle Time per unit in seconds?
A. 0
B. 0
C. 2
D. 0
E. 0
View answer
Correct Answer: E
Question #19
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 #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
Range Charts are the technique used to determine if Special Causes are occurring within the subgroups of the ______________.
A. istograms
B. PC Charts
C. P Charts
D. areto Charts
View answer
Correct Answer: B
Question #22
Relative to a Design of Experiments the term ________________ refers to variables being a linearcombination of each other.
A. irror Image
B. irectly Parallel
C. ollinear
D. one of the above
View answer
Correct Answer: C
Question #23
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 #24
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 #25
Control charts and their limits are the?
A. Voice of the employee
B. Voice of the process
C. Voice of the customer
D. Voice of the team
View answer
Correct Answer: B
Question #26
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 #27
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 #28
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 #29
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 #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
A valid Multiple Linear Regression (MLR) is characterized by all of these except____________.
A. It is an assumption that the X’s (inputs) are not correlated to each other
B. The X’s (inputs) are assumed to be independent of each other
C. MLR is conducted based on a deliberate form of experimentation
D. The Residuals from MLR analysis have to be Normally Distributed
View answer
Correct Answer: C
Question #32
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 #33
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 #34
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 #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
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 #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
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 #39
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 #40
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

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