August 2011
Intermediate to advanced
700 pages
21h 36m
English
Content preview from Statistical Methods for Quality Improvement, Third EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Answers to Selected Exercises
- 1. 9
- 1. S2 = 7.3. Adding a constant to every number in a sample does not change the value of S2.
- 5. (a) 0.95053; (d) 0.9545; (e) z0 = 1.96.
- 7.
. - 9. 0.06681. The probability is approximate since the particular probability distribution was not stated.
- 15. 2. We have 3% as the estimate of the proportion nonconforming, and conclude that the process needs improving.
- 17. 0.9727.
- 22. (c)
- 5. The control limits could be adjusted or a control chart of residuals could be used.
- 20. 80.5
- 2. 13, 2.
- 3. The moving ranges and moving averages are correlated so interpreting the charts can be difficult.
- 5. An
chart is more sensitive in detecting a shift in the process mean (as the answers to exercise 2 indicate).
- 1. 0.0462 and 0.2583.
- 3. Because there will not be a lower control limit.
- 3. (a)
; (c) decrease, 0.02278 (before), 0.0027 (after). - 5. 1.479, no.
- 2. (a) 5.75 assuming a basic CUSUM scheme; (b) 15.
- 3. When doubt exists as to whether or not an assignable cause was removed.
- 1. (a) 11.58.
- 2. (a) No outliers are identified; (b) the estimate of sigma is 3.21.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.