Research Article
Short-Run Control Chart for Multiproducts with Multi-Items Based on Unequal Means and Variances
Table 1
Basic statistics of four SPC products.
| Product | Parameter | Observations | Mean |
| Lamp bracket of Pride | Height of bent | 24 | 40.00 | Length to the edge of bent | 24 | 200.01 | Width to the edge of bent | 24 | 140.01 | Punch diameter | 24 | 10.80 |
| Lock protection of Samand | Height of bent 1 | 24 | 40.00 | Height of bent 2 | 24 | 20.00 | Length | 24 | 300.00 | Distance to punch center | 24 | 100.01 |
| Lock protection of 206 | Height of bent | 24 | 20.00 | Length | 24 | 300.01 | Width | 24 | 200.01 | Punch diameter | 24 | 10.20 |
| Lower holder of injector | Length | 24 | 300.01 | Height of bent 1 | 24 | 70.00 | Height of bent 2 | 24 | 70.01 |
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