Page 441 - Six Sigma Demystified

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41. When the cost of collecting samples is high,
A. you shouldn’t use control charts because sampling inspection is cheaper.
b. subgroups of size five are always best, but they increase the time between
samples.
c. a control chart using a subgroup size of one is preferred.
d. you should ignore the cost because the control chart is always value-added.

42. When process data occur infrequently, subgroups containing more than one
observation
A. might include special causes of variation.
b. generally are not rational subgroups.
c. are poor indicators of short-term variation.
d. All the above are true.

43. defect detection as a means for process control
A. is preferred so long as the detection occurs prior to customer receipt of the
product or service.
b. provides an effective method of improving quality.
c. is usually not as economical in the long run as a preventive approach.
d. All the above are true.

44. When calculating the benefits of training, we should seek to quantify financial
benefits of which of the following?
A. Improved customer satisfaction
b. Lower employee turnover
c. Improved efficiency
d. All the above

45. In a process FMEA, process and/or design changes can
A. reduce the probability of occurrence.
b. reduce the severity ranking.

c. increase the probability of detection.
d. All the above are true.

46. With regard to the detection of process errors,
A. 100 percent inspection is a preferred approach.
b. SPC will detect all errors that can occur.
c. a picture or graphic of the known defects is helpful to guide process operators.
d. it is not necessary to develop detection plans once you achieve high sigma levels.

47. We might choose to simulate a process
A. when the cost of experimentation is high.
b. to test a wide variety of conditions.
c. to generate data useful for training.
d. All the above are true.