IASSC Lean Six Sigma – Black Belt v6.1
Question 1
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
Answer : D
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
Answer : B
Question 3
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
Answer : C
Question 4
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
Answer : BCDE
Question 5
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
Answer : A
Question 6
Fractional Factorial Designs are used to analyze factors to model the output as a function of inputs if Hypothesis Testing in the Analyze Phase was inadequate to sufficiently narrow the factors that significantly impact the output(s).
- A. True
- B. False
Answer : A
Question 7
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
Answer : B
Question 8
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
Answer : C
Question 9
Screening experiments are the proper choice when a Belt is faced with the situation of highly Fractional Factorial Designs.
- A. True
- B. False
Answer : A
Question 10
Which statement(s) are correct about the DOE Factorial plot output here? (Note: There are 3 correct answers).
- A. Two factors were operated at 3 levels each
- B. The highest tool age was achieved with metal hardness at high level while keeping the cutting speed at the low level
- C. The design indicated above is a 32 factorial design
- D. The cutting speed and cutting angle are at the low level for the least tool age achieved
- E. All factors had 2 levels in the experiment
Answer : BCE
Question 11
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
Answer : DE
Question 12
Which statement(s) are most correct for the Regression Analysis shown here?
- A. The Regression explains 50.8% of the process variation
- 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
Answer : B
Question 13
A valid mathematical Regression represents all of the characteristics shown except ___________________________.
- A. The residuals when plotted follow a Normal Distribution
- B. The sum of the residuals is zero
- C. All of the standardized residuals will be within ±3 Standard Deviations
- D. Most standardized residuals are within ±2 Standard Deviations
Answer : C
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
Answer : B
Question 15
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
Answer : C