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Six Sigma
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certifications
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six-sigma
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business-skills
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Regression
Sort - Set in Order - Shine - Standardize - Sustain
Represents the behavior of a process
The amount of variation in the dependent variable that is explained by the variation in the independent variable(s).
Outside.
2. An SPC chart shows no points outside the control limits. Does this mean the process is in control?
The secondary characteristics of a product; "bells and whistles."
No -- the variation also has to be random and "expected."
An assertion or conjecture concerning one or more populations
consists of plotting the residuals vs. the order of each experiment - If - as in the case of the constant variance a random horizontal band is obtained - the ______________ of the residuals is not rejected. (should be random above a below the line i
3. What are the four perspectives of the Balanced Scorecard?
Deming.
The gap between what management thinks customers want and the process specifications.
Financial - customer - internal process - innovation and learning.
Mean time to replacement.
4. What inventory approach contributes to process quality by "lowering the river to find the rocks?"
99.73%
Technique used to relate through a model - one or more independent variables and a dependent variable (response)
1.Interactions can be detected and measured 2.Each value does the work of several values 3.Experimental error is quantified and used to determine the confidence the experimenter has in the conclusions
Lean (or JIT).
5. Daniel Test
F_alpha - df(tr) - df (error)
Another way to assess the significance of the analyzed factors is through a graphic procedure developed by C. Daniel when only one replicate (a single observation) was obtained:
Taguchi
A tool that shows performance along key dimensions all at once.
6. List two appraisal costs.
No -- the variation also has to be random and "expected."
The gap between what is promised and what is delivered.
Incoming materials inspection - inspection and testing - maintaining test equipment - materials/services consumed
A tool that shows performance along key dimensions all at once.
7. What are the four categories of costs in Juran's framework?
95%
It's good -- but it's still out of control!
A tools that is used to measure the amount of variation in the measurement system arising from the measurement device (repeatability) and the people taking the measurement (reproducibility).
Prevention - appraisal - internal failure - external failure.
8. What type of risk is associated with Type 1 Error?
Producer risk.
Kaoru Ishikawa.
The amount of variation in the dependent variable that is explained by the variation in the independent variable(s).
The ratio of outputs to inputs; 1-scrap.
9. Define perceived quality (Garvin's framework).
Inventory = throughput x flow time.
To monitor a process when measurement by attribute is used.
Brand image.
Observed variation in response is caused by the input
10. What is poka yoke?
Mistake-proofing.
To obtain a certain desirable outcome from the process
Quality planning - design review - education and training - process control - IS costs - quality reporting - improvement project costs - working with suppliers before production.
Conformance to specifications.
11. Explain the difference between technical and functional service quality.
Technical quality is the "what" of the service; functional quality is the "how."
A brainstorming tool that shows the connections between ideas.
Because the mean and standard deviation are independent of each other.
Prevention and appraisal costs are balanced against internal and external failure.
12. Who is a process owner?
The manager in charge of a process being improved in a Six Sigma project.
5%
Studying firms with the best performance in a particular area.
Is the consequence of the failure.
13. In the Service Quality Gap Model - what is Gap 1?
Fitness for use.
The gap between what management thinks customers want and what customers really want.
Assigns scores to weighted criteria for each project under consideration.
How much variance you expect around the prediction; two SEs gives you a 95% confidence interval.
14. What is a spaghetti diagram?
Stratify a particular defect type according to logical criteria
Prevention and appraisal costs are balanced against internal and external failure.
A tool that shows the physical flows through a space.
Not necessarily.
15. Effect ranking (Severity of the Defect)
Is the way in which the failure is manifested.
10 for Hazardous without warning 1 for none
Because the mean and standard deviation are independent of each other.
Through producer/consumer negotiation.
16. If you have calculated a Cpk - should you also calculate a Cp?
Lower skill requirements - faster - less chance for error.
No; if the process is centered - Cp will be the same; if not - Cpk is what you need to determine capabilty.
p-bar - the long-run percent defective.
Mistake-proofing.
17. What are the 5 Ss?
Walter A. Shewhart
1) Identify the Range (Max Value - Min Value) 2) Determine # of bins 3) Determine the Width of each bin --> (Range / # Bins) 4) Put values in correct Bin
The process of ranking opportunities to determine which of many potential opportunities should be pursued first.
Sort - Set in Order - Shine - Standardize - Sustain
18. What is the 5S model?
Assigns scores to weighted criteria for each project under consideration.
Waste.
System to reduce waste and optimize productivity through maintaining an orderly workplace and using visual cues to achieve more consistent operational results.
Taguchi
19. Definition of Interaction
An interaction is defined as a dependence relationship between the response and the levels of two or more variables
Someone who is consistently against virtually everything.
10 for Hazardous without warning 1 for none
The process of ranking opportunities to determine which of many potential opportunities should be pursued first.
20. Presence of interaction effect
To do a capability study for a non-centered process.
A scatterplot.
X-bar-bar
If the Response vs. Levels graph if the response lines are not parallel (crossing)
21. FMEA
Brand image.
No; if the process is centered - Cp will be the same; if not - Cpk is what you need to determine capabilty.
Inventory = throughput x flow time.
It looks to minimize the probability of a failure - or to minimize its effects
22. If a Cp shows that a process is not capable - should you calculate Cpk?
Controlling quality at the source.
Variable.
Incoming materials inspection - inspection and testing - maintaining test equipment - materials/services consumed
No -- if it is not the same - it can only be worse!
23. If your process is capable at two sigma - what percentage of the output will you have to inspect to find defectives?
Lean (or JIT).
The secondary characteristics of a product; "bells and whistles."
100%
The process of ranking opportunities to determine which of many potential opportunities should be pursued first.
24. When yields decrease - what are the two effects on contribution?
The gap between specifications and how service is performed.
Variable.
Shifts - Trends - Repeating patterns - Correlation with known events
Fewer good units to sell - increased variable cost/unit.
25. Based on what principal can we use the normal distribution assumptions for SPC?
Central Limit Theorem
1) Plot a Line chart of the data in time sequence 2) Draw a line at the median
0.9^3 or 72.9%
Reliability - Assurance - Responsiveness - Tangibles - Empathy
26. You have been plotting sample means on an x-bar chart and all points indicate normal - expected variation. Is the process in control?
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27. What is the formula for standard deviation?
A scatterplot.
Stratify a particular defect type according to logical criteria
Represent the errors which are random variables with an assumed normal distribution with mean zero and a constant variance σ2.
=sqrt(Σ(x-x-bar)^2)/(n-1))
28. What is written on the "spines" of a fishbone diagram?
Causes that lead to a particular effect.
Rank of 10 if there is >= 100 per 1000 piece Rank of 1 if there is <=.01 per 1000 pieces
The secondary characteristics of a product; "bells and whistles."
68%
29. What is a Pareto chart?
Is the way in which the failure is manifested.
A descending order-sorted bar chart with a cumulative percentage line.
1) Identify the Range (Max Value - Min Value) 2) Determine # of bins 3) Determine the Width of each bin --> (Range / # Bins) 4) Put values in correct Bin
99.73%
30. Regression Analysis
Lean (or JIT).
Technique used to relate through a model - one or more independent variables and a dependent variable (response)
0.9^3 or 72.9%
Sort - Set in Order - Shine - Standardize - Sustain
31. In a regression - what does the coefficient of the intercept tell you
What the value of the dependent variable is when the independent variable is zero.
Kaoru Ishikawa.
Pleasing to the senses.
Variable.
32. Why do you need two control charts for variables SPC?
Because the mean and standard deviation are independent of each other.
Technical quality is the "what" of the service; functional quality is the "how."
Before production starts
Can't tell without a Range chart.
33. What is a Gage R&R?
Scrap - rework - retest - downtime - yield losses - disposition costs.
Concluding there has been an effect/change when there has not.
To mentor/coach (and sometimes train) black belts.
A tools that is used to measure the amount of variation in the measurement system arising from the measurement device (repeatability) and the people taking the measurement (reproducibility).
34. Failure Mode
The degree to which a product meets pre-established standards.
Is the way in which the failure is manifested.
Outside.
3.4 (assuming 1.5 sigma shift in the mean)
35. What is the Deming Prize?
The Japanese national quality award.
Taguchi
They move closer to the center line.
Not necessarily.
36. Which quality guru developed the concept of loss to society?
Rapid improvement process.
Taguchi
100%
No -- only if the process is also capable.
37. What does DMAIC stand for?
Define - measure - analyze - improve - control.
Mean time to replacement.
Studying firms with the best performance in a particular area.
Vary two or more variables simultaneously - Multiple measurements are obtained under the same experimental conditions
38. What is the formula for the standard deviation of a proportion?
Sampling for SPC is done real time.
=sqrt((p*(1-p)/n)
Technical quality is the "what" of the service; functional quality is the "how."
Studying firms with the best performance in a particular area.
39. What are the four regression assumptions?
Reliability - Assurance - Responsiveness - Tangibles - Empathy
The manager in charge of a process being improved in a Six Sigma project.
Linearity - normality - homoscedasticity - independence.
The amount of variation in the dependent variable that is explained by the variation in the independent variable(s).
40. In the Service Quality Gap Model - what is Gap 2?
The gap between what management thinks customers want and the process specifications.
Shows the temporal flow of activities in a project network.
Define - measure - analyze - design - verify.
Prediction and estimation. based on an unknown x value - estimation is based on a known x value
41. Residual
Represent the errors which are random variables with an assumed normal distribution with mean zero and a constant variance σ2.
Workers - machines - materials.
The cycle time required to meet demand.
A systemized group of activities designed to 1. recognize and evaluate the potential failure of product/process and its effects 2. Identify actions which could eliminate or reduce the chance of potential failure ocurring 3. document the process
42. Statistical Hypothesis
A systemized group of activities designed to 1. recognize and evaluate the potential failure of product/process and its effects 2. Identify actions which could eliminate or reduce the chance of potential failure ocurring 3. document the process
consists of plotting the residuals vs. the order of each experiment - If - as in the case of the constant variance a random horizontal band is obtained - the ______________ of the residuals is not rejected. (should be random above a below the line i
Shifts - Trends - Repeating patterns - Correlation with known events
An assertion or conjecture concerning one or more populations
43. When either attribute or variable measures could be used for SPC - why might attribute measurement be preferred?
A time series plot.
= y = Beta(0) + Beta(1)X + epsilon y=dependent variable (response) x=independent variable (predictor of y) - epsilon=error component - Beta(not)=intersection. If data include zero - it represents the mean of the distribution of y when - x=0. It does
Lower skill requirements - faster - less chance for error.
An assertion or conjecture concerning one or more populations
44. What is Type 1 Error?
Concluding there has been an effect/change when there has not.
Before production starts
Blame.
Attribute.
45. One factor at a time (OFAT)
100%
Hold all input variables constant except one. Observe the response as you vary the single input.
Workers - machines - materials.
Mistake-proofing.
46. What quality tool formally incorporates the voice of the customer?
Define - measure - analyze - design - verify.
Brand image.
QFD
Inventory = throughput x flow time.
47. Pareto Analysis
A time series plot.
The ratio of outputs to inputs; 1-scrap.
The process of ranking opportunities to determine which of many potential opportunities should be pursued first.
To do a capability study for a non-centered process.
48. Define performance quality.
To monitor a process when measurement by attribute is used.
=sqrt((p*(1-p)/n)
The primary operating characteristics of a product.
A tool that shows the physical flows through a space.
49. What does a project prioritization matrix do?
Assigns scores to weighted criteria for each project under consideration.
If the Response vs. Levels graph if the response lines are not parallel (crossing)
Performance - features - conformance - reliability - durability - serviceability - aesthetics - perceived quality
Mean time to replacement.
50. What is the difference between Lean and Six Sigma?
The House of Quality.
X-bar-bar
Lean is waste reduction - Six Sigma is variation reduction.
Because the mean and standard deviation are independent of each other.
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