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प्रश्न
What do you mean by product control?
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उत्तर
Product Control means that controlling the quality of the product by critical examination through sampling inspection plans.
Product Control aims at a certain quality level to be guaranteed to the customers.
It attempts to ensure that the product sold does not contain a large number of defective items.
Thus it is concerned with classification of raw materials, semi-finished goods or finished goods into acceptable on rejectable products.
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The following data show the values of sample means and the ranges for ten samples of size 4 each. Construct the control chart for mean and range chart and determine whether the process is in control.
| Sample Number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| `bar"X"` | 29 | 26 | 37 | 34 | 14 | 45 | 39 | 20 | 34 | 23 |
| R | 39 | 10 | 39 | 17 | 12 | 20 | 05 | 21 | 23 | 15 |
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`bar"X"` chart is a
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R is calculated using
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The upper control limit for `bar"X"` chart is given by
