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प्रश्न
Write the control limits for the mean chart
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उत्तर
The calculation of control limits for `bar"X"` chart in two different cases are
| Case (i) When `bar"X"` and SD are given |
Case (ii) When `bar"X"` and SD are not given |
|
UCL `\overset{==}{"X"} + sigma/sqrt("n")` CL = `\overset{==}{"X"}` LCL = `\overset{==}{"X"} - 3 sigma/sqrt("n")` |
UCL = `\overset{==}{"X"} + "A"_2 bar"R"` CL = `\overset{==}{"X"}` LCL = `\overset{==}{"X"} - "A"_2bar"R"` |
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| `bar"X"` | 49 | 45 | 48 | 53 | 39 | 47 | 46 | 39 | 51 | 45 |
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| R | 2 | 5 | 4 | 2 | 3 | 2 | 4 | 3 |
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| Sample Mean | 1080 | 1390 | 1460 | 1380 | 1230 | 1370 |
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