ch03 - File: ch03, chapter 3: Statistical Quality Control...

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File: ch03, chapter 3: Statistical Quality Control True/False The Basics of Statistical Process Control 1. Statistical process control involves monitoring the process to detect and prevent poor quality. Ans: True Difficulty: Easy 2. Statistical process control can be used to prevent poor quality before it occurs if a pattern is evident. Ans: True Difficulty: Easy 3. Special cause variability is due to natural variation inherent to the process. Ans: False Difficulty: Moderate 4. Process control charts are not useful for monitoring in service processes. Ans: False Difficulty: Easy 5. Statistical process control is a subset of statistical quality control. Ans: True Difficulty: Easy
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6. Statistical process control is based on a philosophy of inspection as opposed to prevention. Ans: False Difficulty: Moderate 7. One reason some companies fail in their attempt to apply statistical process control is lack of training. Ans: True Difficulty: Easy 8. One goal of statistical process control is to prevent a process from producing items that have to be scrapped or reworked. Ans: True Difficulty: Easy 9. Two types of variation associated with the output of a process are common (random) cause and special cause. Ans: True Difficulty: Easy 10. Control limits are based on the special cause variation inherent in a process. Ans: False Difficulty: Moderate 11. A process that is determined to be in control contains no variation. Ans: False Difficulty: Easy
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12. Common cause (random) variation provides evidence that the process is not in control. Ans: False Difficulty: Easy 13. Employee training in statistical process control is a fundamental principle in total quality management programs. Ans: True Difficulty: Moderate 14. Statistical process control is a tool used to monitor and improve quality. Ans: True Difficulty: Easy 15. Statistical process control is only effective for service processes. Ans: False Difficulty: Easy 16. After special cause variation is detected, the focus changes to identifying the root cause of the variation and eliminating it. Ans: True Difficulty: Hard 17. Possible root causes of special cause variation include all of the following except: a. operator error b. process out of adjustments c. over producing d. defective materials
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Ans: c Difficulty: Moderate Feedback: The Basics of Statistical Process Control Control Charts 18. Process control is achieved by taking periodic samples from a process and plotting the sample average points on a chart to determine if the process is within control limits. Ans: True Difficulty: Easy 19. All processes contain a certain amount of variability in their output. Ans: True Difficulty: Easy 20. Special cause variability can be identified using statistical process control. Ans: True
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ch03 - File: ch03, chapter 3: Statistical Quality Control...

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