We plot an X̄-R chart to see whether the process is stable.
我们绘制 X̄-R 控制图来判断过程是否稳定。
After the tool change, the X̄-R chart showed the mean shifting upward while the range stayed in control, suggesting a consistent but offset process.
更换刀具后,X̄-R 控制图显示均值上移而极差仍受控,这表明过程一致但整体发生了偏移。