1-20chapter stats

True false 8 a goal of statistical process control is

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Unformatted text preview: ______. A. Tight, increases B. Loose, increases C. Loose, decreases D. None of the above 37. In a manufacturing process, if the limits for a control chart are set too _____________, the risk of unnecessarily tampering with the process ____________. A. Tight, increases B. Loose, increases C. Tight, decreases D. None of the above 38. Which of the following is not evidence of an assignable cause? A. There are 8 consecutive points above the mean. B. There are 9 consecutively decreasing points. C. There is a point below the lower control limit. D. There are 2 out of 3 consecutive points in Zone A. E. There are 4 out of 5 consecutive points in Zone C. 39. The natural tolerance limits for a normally distributed process that is in statistical control: A. Extend beyond the specification limits when a process is capable B. Are within the specification limits when a process is capable C. Contain approximately 99.73 percent of the individual process measurements D. Both B and C are correct E. Both A and C are correct 1-1669 Chapter 01 - An Introduction to Business Statistics 40. Common causes of process variation: A. Are sources of unusual process variation B. Usually must be remedied by management C. Usually must be remedied by local supervision D. Always exist together with assignable causes of variation E. Can never be remedied or reduced 41. When a process is influenced only by common causes of variation: A. The process may also be influenced by assignable causes of variation. B. Many plot points on a control chart will be outside the control limits. C. The process is always capable of meeting customer requirements. D. The process is in statistical control. E. The process is never capable of meeting customer requirements. 42. If the ________ limits are within the ________ limits, then it can be concluded that the process is __________. A. Specification, natural, capable B. Natural, specification, stable C. Specification, natural, stable D. Natural, specification, capable 43. In 25 samples of 100 units each, 75 units were found to be defective. Find the appropriate UCL and LCL for the p-chart. A. 0 to .0642 B. 0 to .0828 C. 0 to .0812 D. .0129 to .0471 E. 0 to .1324 1-1670 Chapter 01 - An Introduction to Business Statistics 44. For a manufacturing process, = 10 inches, = .4 inches and the subgroup sample size is 6 units. Calculate the natural tolerance limits for this process. A. 9.526 to 10.474 B. 9.510 to 10.490 C. 9.484 to 10.516 D. 9.807 to 10.193 E. 9.769 to 10.231 45. For a manufacturing process, size is 6 units. = 10 inches, Calculate the standard control limits for the A. 9.526 and 10.474 B. 9.769 and 10.231 C. 9.807 and 10.193 D. 9.484 and 10.516 E. 8.80 and 11.20 = .4 inches and the subgroup sample chart. 46. For a manufacturing process, = 10 inches, size is 6 units. Calculate the standard control limits for the R chart. A. 0 and .846 B. 0 and .802 C. 0 and .77 D. 0 and 1.0 E. -.09 and .89 1-1671 = .4 inches and the subgroup sample Chapter 01 - An Introduction to Business Statistics 47. A powder metal manufacturing company is producing sleeves for a locking mechanism. The target (nominal) value for the inside diameter is 1 inch. The inside diameter specifications are 1 ± .005 inches. Assume that the process is in statistical control with = 1.0002 inches, = .003 inches and subgroup size of 5. Calculate the control limits for the A. .99781 to 1.00219 B. .99801 to 1.00238 C. .99830 to 1.00713 D. .99847 to 1.00193 E. .995 to 1.005 chart. 48. A powder metal manufacturing company is producing sleeves for a locking mechanism. The target (nominal) value for the inside diameter is 1 inch. The inside diameter specifications are 1 ± .005 inches. Assume that the process is in statistical control with = 1.0002 inches, = .003 inches and subgroup size of 5. What are the natural tolerance limits for this process? Is the process capable? A. .99847 to 1.00193, yes B. .99847 to 1.00193, no C. .99633 to 1.004, yes D. .99633 to 1.004, no E. .995 to 1.005, yes 49. A powder metal manufacturing company is producing sleeves for a locking mechanism. The target (nominal) value for the inside diameter is 1 inch. The inside diameter specifications are 1 ± .005 inches. Assume that the process is in statistical control with inches, = .003 inches and subgroup size of 5. What is the sigma level capability for this process? A. 3.0 B. 3.72 C. 1.6 D. 1.0 E. 2.72 1-1672 = 1.0002 Chapter 01 - An Introduction to Business Statistics 50. A powder metal manufacturing company is producing sleeves for a locking mechanism. The target (nominal) value for the inside diameter is 1 inch. The inside diameter specifications are 1 ± .005 inches. Assume that the process is in statistical control with = 1.0002 inches, = .003 inches and subgroup size of 5. Determine the estimated number of standard deviations of process leeway. A. 3 B. 1.667 C. 3.72 D. 1.443 E. .72 51. A powder metal manufacturing company is producing sleeves for a locking mechanism. The target (nominal) value for the inside diameter is 1 inch. The inside diameter specifications are 1 ± .005 inches. Assume...
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