R chart
MiniTAB帮助文件的xbar-R例题的解释不是很清楚，如何理解后面这句话？
Interpreting the results:
The center line on the X chart is at 600.23, implying that your process is falling within the specification limits, but two of the points fall outside the control limits, implying an unstable process. The center line on the R chart, 3.890, is also quite large considering the maximum allowable variation is +/-2mm, There may be excess variability in your process.
Interpreting the results:
The center line on the X chart is at 600.23, implying that your process is falling within the specification limits, but two of the points fall outside the control limits, implying an unstable process. The center line on the R chart, 3.890, is also quite large considering the maximum allowable variation is +/-2mm, There may be excess variability in your process.
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