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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
The following are the numbers of defective solder joints found during successive samples of 500 solder joints:
|
Day |
No. of Defectives |
Day |
No. of Defectives |
|
1 |
106 |
12 |
37 |
|
2 |
116 |
13 |
25 |
|
3 |
164 |
14 |
88 |
|
4 |
89 |
15 |
101 |
|
5 |
99 |
16 |
64 |
|
6 |
40 |
17 |
51 |
|
7 |
112 |
18 |
74 |
|
8 |
36 |
19 |
71 |
|
9 |
69 |
20 |
43 |
|
10 |
74 |
21 |
80 |
|
11 |
42 |
 |
 |
(a) Using all the data, compute trial control limits for a fraction-defective control chart, construct the chart, and plot the data.
(b) Determine whether the process is in statistical control. If not, assume assignable causes can be found and out-of-control points eliminated. Revise the control limits.
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