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Unformatted text preview: ch9a Student: ___________________________________________________________________________ 1. Variation in production systems that is caused by factors that can be clearly identified and possibly even managed is called assignable variation. True False 2. An example of assignable variation in a production system may be that workers are not identically trained. True False 3. An example of assignable variation in a production system may be that a machine is not adjusted properly. True False 4. Variation that is inherent in a production process itself is called assignable variation. True False 5. Variation that is inherent in a production process itself is called common variation. True False 6. It is impossible to have zero variability in production processes. True False 7. Genichi Taguchi's view of the cost of quality is that variance is a discontinuous function. True False 8. The capability index is used to gauge economic changes in service systems. True False 9. Process control is concerned with monitoring quality after the product or service has been produced. True False 10. Statistical process control involves testing random samples of output from a process to determine whether the process is producing items within a pre-selected range. True False 11. Measurement by attributes means taking a sample, measuring the attribute in question and determining the level of quality in the population from which the sample was drawn. True False 12. Attributes are those quality characteristics that are classified as either conforming or not conforming to specification. True False 13. A "p chart" has upper and lower control limits expressed as lines on the chart. As long as the sample values fall between these two lines there is no need to investigate process behavior. True False 14. The "p chart" is only useful for sampling that deals with continuous variables. True False 15. The value for "z" used in quality control charts is based on the degree of confidence you want to have in the resulting UCL and LCL values. True False 16. If the fraction defective is 0.12 based on a sample size of 16, the standard deviation used in the "p" chart is about 0.08. True False 17. If the fraction defective is 0.4 based on a sample size of 100, the standard deviation used in the "p" chart is about 0.10. True False 18. To obtain a 99.7 percent confidence level in a "p" chart we would use a value of 3 for "z". True False 19. Acceptance sampling is performed on goods that already exist to determine what percentage of items conforms to specifications. True False 20. In acceptance sampling, the number of units in the sample (n) is determined by the interaction of the acceptable quality level (AQL), the lot tolerance percent defective (LTPD), the probability of rejecting a high quality lot (alpha) and the probability of accepting a low quality lot (beta)....
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This note was uploaded on 01/05/2012 for the course COMMERCE 398 taught by Professor Dale during the Spring '11 term at The University of British Columbia.
- Spring '11