# ch13test - Chapter 13 Quality Control and Improvement...

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Chapter 13 Quality Control and Improvement True/False Questions 1. When using control charts, it is assumed that the variable in question is at least approximately normally distributed. Answer: True Type: Concept Difficulty: Easy 2. When an observation is outside the control limits of a control chart, the process is said to be in control. Answer: False Type: Concept Difficulty: Easy 3. A process is considered to be in control, statistically, when the only variation present is due to natural variation. Answer: True Type: Concept Difficulty: Easy 4. A control is useful since it detects both types of variation, that due to assignable causes and that due to natural variation. Answer: False Type: Concept Difficulty: Easy 5. The most important idea in statistical quality control is that of the variance. Answer: True Type: Concept Difficulty: Easy 6. A Pareto diagram is used by management to help detect significant problems in the process. Answer: True Type: Concept Difficulty: Easy 7. Acceptance sampling is used to directly improve the quality of products. Answer: False Type: Concept Difficulty: Easy 8. Taguchi methods aim at producing the optimal value for a parameter in a production process. Answer: True Type: Concept Difficulty: Easy 232 Aczel, Complete Business Statistics, Sixth Edition

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Chapter 13 Quality Control and Improvement 9. In an actual quality control program, the first test would be to detect shifts in the population mean. Answer: False Type: Concept Difficulty: Medium 10. The idea of an x-bar chart is the same as the idea of confidence limits on the mean. Answer: True Type: Concept Difficulty: Medium 11. The center-line of the x-bar chart is the grand mean of all the observations. Answer: True Type: Concept Difficulty: Medium 12. In the x-bar chart analysis, s is used to estimate only when n is at least 30. Answer: False Type: Concept Difficulty: Medium 13. It is important in quality control, to keep the variance as large as possible. Answer: False Type: Concept Difficulty: Easy 14. The lower limit of the R chart is bounded by zero. Answer: True Type: Concept Difficulty: Easy 15. The distribution of the sample range is normal. Answer: False Type: Concept Difficulty: Medium 16. If all sample ranges are within bounds on an R chart, the process is said to be in control. Answer: True Type: Concept Difficulty: Easy 17. The binomial distribution is never symmetric. Answer: False Type: Concept Difficulty: Easy 18. The central limit theorem is the rationale behind the control chart for p. Answer: True Type: Concept Difficulty: Medium 233 Aczel, Complete Business Statistics, Sixth Edition
Chapter 13 Quality Control and Improvement 19. In the Poisson distribution, the mean and the variance are equal. Answer: True Type: Concept Difficulty: Medium 20. An x chart is another name for an x-bar chart.

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• Spring '06
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