问题
单项选择题
在实际应用控制图评价过程性能指数时，一般选择图上点子比较正常波动的平稳段判稳(点子数＞25)，将该段的标准差作为（）。
A．A
B．B
C．C
D．D
答案
参考答案：A
解析：
过程性能指数计算公式中σ的估计采用
，它是在实际情况（不一定是稳态)下计算的。
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在实际应用控制图评价过程性能指数时，一般选择图上点子比较正常波动的平稳段判稳(点子数＞25)，将该段的标准差作为（）。
A．A
B．B
C．C
D．D
参考答案：A
解析：
过程性能指数计算公式中σ的估计采用，它是在实际情况（不一定是稳态)下计算的。
| 阅读理解 | ||||||||||
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