Lean Six Sigma - Control Phase
The probability that a X-bar point will fall outside of control limits is determined by the following except
Answer: Comparing the F statistic to the F table Comparing the F statistic to the F table Calculating Upper and Lower Control Limits Calculating the Standard Error of Mean Comparing the Z statistic to the Z table
The following are true for Attributes charts except.
Answer: Constant sample sizes use the u chart Constant sample sizes use the u chart Nonconforming units is np chart Proportion of nonconforming units is p chart Number of defects is c chart
Which of the following documentation is not needed for the project handoff?
Answer: DOE Plan Control Plan DOE Plan Training and Orientation Methods Storyboard
Which of the following is found in a control plan?
Answer: Designated control methods, tools and systems. The ANOVA results of a designed experiment. Designated control methods, tools and systems. A value stream map. A fishbone diagram for mistake proofing.
Final costs and benefits will not include:
Answer: Estimated value of future related projects Tangible improvements Intangible benefits Verified accounting Estimated value of future related projects
The best source for developing a Control Plan would be which of the following?
Answer: FMEA Poka-Yoke Control Chart House of Quality FMEA
A Storyboard presentation summarizes the important deliverables of all phases and must be a single slide in length.
Answer: False. True. False.
Everything the Process Owner needs to sustain the improved performance is contained on the Control Plan document.
Answer: False. True. False.
Good Risk Management protocols and practices will eliminate the likelihood of all significant risks.
Answer: False. True. False.
The FMEA tool is a recommended tool to assess risk because of its objectivity.
Answer: False. True. False.
The project review for turn-over should include the full team and include all details for justifying the solution.
Answer: False. True. False.
Legal requirements specify that a bottled product must contain no less than the volume printed on the label. A bottling company wants to reduce the amount of overfilled bottles. On the basis of the data below, what is the most effective strategy to accomplish this task?
Answer: First decrease the target fill variation, then decrease the target fill volume Decrease the target fill volume only Decrease the target fill variation only First decrease the target fill volume, then decrease the target fill variation First decrease the target fill variation, then decrease the target fill volume
What do I do if I detect a change in the process?
Answer: Investigate for probable special cause(s). Ignore it until more data is available. Investigate for probable special cause(s). Plan response - seek advice from a MBB. Advise the customer and ask if they have detected anything.
When analyzing a control chart and finding an "out-of-control" trend:
Answer: Investigate the process for assignable causes. Investigate the process for assignable causes. Maintain the status quo Immediately adjust the process Stop recording and switch to Pre-Control methods
Monitoring is a critical activity for control. Which of the following must be monitored for proper control?
Answer: Key process variables. All process variables. Employee responsibilities. All incoming resources. Key process variables.
The primary purpose of a Failure Modes and Effects Analysis is to:
Answer: Manage Failure Risks Solve Problems Manage the Product or Service to Be Delivered Manage Failure Risks Satisfy the Customer
The objective(s) of the Control Phase include:
Answer: Mechanisms to maintain improved performance. Mechanisms to maintain improved performance. Enabling the Process Owner and her team to implement the improved performance. Review the alternatives for achieving the project goal. Maintain the Green Belt to lead the improved process. Choices a and b are correct.
Which of the following is not characteristic of good documentation?
Answer: More documentation is better than too little State a practical reason for the information Understand your audience More documentation is better than too little Both a. and b. Both b. and c.
Which of the following is not a primary control mechanism?
Answer: Organization Strategy Risk Management Mistake Proofing SPC and SQC Organization Strategy
The analysis of lessons learned, or what went well and what went wrong during a project would most likely take place during which of the following?
Answer: Post mortem analysis. Milestones reporting. Document archiving. Post mortem analysis. Project champion updates.
Inherent process variation is distinct from all except:
Answer: Product Spread Common causes Piece to Piece variation Time to Time variation Product Spread
Which of the following is not part of the FMEA tool?
Answer: Risk Priority Scale Severity Estimate Potential Failure Mode Risk Priority Scale Detectability estimate
Pre-Control centers the process between
Answer: Specification limits Specification limits Six Sigma control limits Short Run limits ANOVA results
Statistical control is achieved in this case:
Answer: Stable processes have only common cause variation Stable processes have only common cause variation Stable processes have assignable causes of variation Processes have inherent variation exceeding control limits. Control charts are regularly produced for audit trail purposes.
The FMEA tool is used to assess risk from the current process and with the future improvements.
Answer: True. True. False.
Control charts should be set up for
Answer: Vital quality characteristics Answers: Vital quality characteristics All quality characteristics All product characteristics All inspection characteristics
A major drawback of using histograms in process control is that they
Answer: do not readily account for the factor of time do not readily account for the factor of time are relatively difficult to construct and interpret require too many data points require too many intervals
A process capability analysis is NOT used to
Answer: maintain a process in a state of statistical control determine the ability of a process to meet specifications maintain a process in a state of statistical control establish new specifications prioritize competing processes
In statistical process control, when a point falls outside of control limits, the probability is quite high that the process is experiencing _____________ .
Answer: special cause variation common cause variation student t variation a reduction of variables special cause variation
A six sigma team is investigating the sources in variation of fabric rolls. All roles are different in lengths. The variable of interest is the number of holes per unit of length. Which control chart will work best for this situation?
Answer: u chart x-bar and R chart p chart c chart u chart
A process has been experiencing problems lately. The operators charting the process have identified the cause to be due to a change in incoming materials. This problem is:
Answer: A special cause Attributed to purchasing A special cause A common cause A normal event
Mistake Proofing means:
Answer: All of the above A technique for eliminating errors. A means to make mistakes impossible. Is used avoid human error Is also called Poka Yoke All of the above
Considerations for how much data to collect (measurements to make) include:
Answer: All of the above Impact of process Y on customer satisfaction Impact of each X on Y Cost to obtain measurement All of the above
Which should be included with project documentation?
Answer: All of the above Process flowcharts Standard operating procedures Process installation guides All of the above None of the above
Select the following means to identify risk.
Answer: All of the above. Brainstorming of knowledgeable individuals. Review of lessons learned. Failure Modes & Effects Analyses (FMEAs). All of the above.
Which of the following are deliverables for the Control Phase?
Answer: All of the above. Risk Analysis of the solution. Documented Control Plan. Training for procedures and responsibilities. Choices a and b are correct. All of the above.
A Measurement System Analysis is reconsidered for Control because:
Answer: All of the above. The process team will have to do the measurements on a frequent basis. Changes have been made in the operational factors. It is necessary to make sure the measurement system is capable. All of the above.
Which of the following are associated with Risk Management?
Answer: All of the above. The use of risk abatement plans. Identification and quantification of risk elements such as technical, cost, scheduling, marketing risk elements. Highlighting and managing risk as early as possible All of the above.
A p-chart showing high levels of defectives can be improved by the following except:
Answer: Applying 100% inspection. Applying 100% inspection. Revising the design. Revising the process. Substituting inferior materials and components with superior alternatives.
A special cause of process variation is:
Answer: Assignable to a correctable problem. Assignable to a correctable problem. A normal event. Inherent in the process Only changeable with corporate quality objectiv
