08 May QuestionThis case study looks at the behavior of a circuit board process through
Question
This case study looks at the behavior of a circuit board process through the use of control charts. At least two control charts will need to be constructed, and from them you will be asked to provide an assessment of what you see. A template to facilitate the construction of the control charts has been provided in Doc Sharing. You are not required to use this template, however, it will greatly facilitate the solution.
Problem Statement
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 four boards each were taken from shipments from the supplier as shown in the data from the worksheet below. Data in the worksheet below can also be accessed in Doc Sharing in a file named Fujiyama Electronics Sample Data.
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 |
| 3 | 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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