Practical Management Science
6th Edition
ISBN: 9781337406659
Author: WINSTON, Wayne L.
Publisher: Cengage,
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Defects Problem: The housekeeping supervisor of a hotel has been concerned about the number defects in rooms recently cleaned. In order to evaluate the true magnitude of the problem the supervisor has selected a random sample of 20 rooms each over a ten week period. The number of rooms with defects are as follows:
| Week | Number of Defects |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 2 |
| 4 | 1 |
| 5 | 4 |
| 6 | 1 |
| 7 | 2 |
| 8 | 0 |
| 9 | 3 |
| 10 | 1 |
Determine the centerline, the upper and lower control limits
******The answer below was answered by another expert of yours and it was incorrect...Please give me the correct answer, please. Thanks*****
Center Line: 1.8 Upper Control Limits: 5.82 Lower Control Limits: 0
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- 30 The upper and lower limits for diving ring diameters made by John's Swimming Co. are 40 and 39 cm., respectively. John took 11 samples with the following average diameters (39, 39.1, 39.2, 39.3, 39.4, 39.5 39.6, 39.7, 39.8, 39.9, 40). Is the process in control? Select one: a. no, there is a distinguishable pattern in the samples. b. Yes, no diameters exceeded the control limits. c. no, the range is not in control. d. no, some diameters exceeded the control limits. e. There is not enough information to make a decision.arrow_forwardThe upper and lower specification limits for a component are 5.20, and 5.30 ounces, respectively. The process standard deviation is .05, and the process average is 5.24 ounces. a) Calculate Cpk. (Show formula and calculations) b) Does the process posses six sigma capability? Why or Why not? Please explain.arrow_forward621 Daily samples of 100 power drills are removed from Drill Master's assembly line and in- spected for defects. Over the past 21 days, the following information has been gathered. Develop a 3 standard deviation (99.73% confidence) p-chart and graph the samples. Is the process in control? Number of Defective Drills Number of Defective Drills Day Day 6. 12 13 4 5. 14 3 15 16 17 6. 18 5. 8. 19 9. 20 3 10 21 7 11 643t n36 37 123 456Narrow_forward
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