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Question
Choose the correct alternative:
The upper control limit for `bar"X"` chart is given by
Options
`bar"X" + "A"_2bar"R"`
`\overset{==}{"X"} + "A"_2 "R"`
`\overset{==}{"X"} + "A"_2 bar"R"`
`\overset{==}{"X"} + "A"_2 overset{==}{"R"}`
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Solution
`\overset{==}{"X"} + "A"_2 bar"R"`
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| `bar"X"` | 12 | 13 | 11 | 12 | 14 | 13 | 16 | 15 |
| R | 2 | 5 | 4 | 2 | 3 | 2 | 4 | 3 |
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