Fujiyama Electronics Case Study

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rsantos_-_fujiyamaelectronicsdata.xlsx
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Sheet1

Fujiyama Electronics, Inc. has had difficulties with circuit boards purchased from an outside supplier. Unacceptable variability occurs between two drilled holes that are supposed to be 5 cm apart on the circuit boards. Thirty samples of 4 boards each were taken from shipments from the supplier as shown in the data from the worksheet.
1. Calculate X-Bar-Bar, R-Bar, and associated control limits using the data in the table above. 2. Create X-Bar•R (Average & Range) Control Charts from the data in table above. 3. Discuss notable out-of-control conditions displayed in the completed X-Bar•R (Average & Range) Control Charts. Only consider points outside the Control Limits. Do not consider runs, set of points within certain zones, etc. 4. If the conditions you note could be defined as assignable conditions and they are removed from the process, what will happen to the X-Bar•R Control Chart? (a) Remove the data related to the out-of-control points you observed from the origainal data and recalculate a new X-Bar-Bar, R-Bar, and associated control limits. (b) Create new X-Bar•R (Average & Range) Control Charts from your updated data. 5. Discuss how the two sets for Controls are different. What has changed? The format of the case study should conform to the Publication Manual for the American Psychological Association (APA), 6th edition, for title page & text. Citations and references are not required. The completed case study will be submitted to your Dropbox as a MS-Word document. All graphics and charts will be a part of the Word document and submitted as a file. Documents authored in other applications such as WordPerfect or MS-Works will not be accepted.
Fujiyama Electronics
Observations
Sample 1 2 3 4
1 4.92 4.26 4.94 4.29
2 4.65 5.54 5 5.42
1 5.77 5.26 4.76 4.79
4 6.25 4.88 5.66 4.44
5 5.27 5.41 6.02 4.91
6 5.22 5.38 5.08 4.65
7 5.47 4.68 4.56 4.7
8 5.71 4.54 4.17 4.87
9 5.24 5.58 4.72 5.41
10 4.42 5.18 4.79 4.73
11 5.14 4.26 4.71 5.48
12 4.92 5.78 5.5 5.05
13 5.79 3.83 4.3 4.78
14 4.92 4.8 4.75 5.59
15 5.68 5.74 4.65 5.2
16 5.43 4.81 5.27 4.96
17 4.79 6.04 4.47 5.18
18 4.43 5.08 3.69 6.43
19 6.35 5.95 6.29 5.89
20 5.03 4.66 5.25 4.46
21 6.32 6.09 5.57 5.91
22 4.3 5.47 4.27 4.34
23 6.07 4.97 5.51 5.02
24 5.11 4.9 5.91 4.66
25 4.5 5.24 4.86 4.35
26 4.91 4.79 5.74 5.03
27 4.65 4.71 4.81 5.32
28 4.7 5.5 6.04 4.3
29 5.87 5.3 5.78 5.07
30 4.41 4.75 4.95 5.11

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