ppk计算公式中标准差s如何计算？ - 六西格玛绿带黑带考试|视频课程|考试题库一站式平台

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ppk计算公式中标准差s如何计算？

请问过程绩效指数ppk计算公式中标准差s如何计算？我看有的公式分母是s，还有的公式分母s/c4，请问哪一个正确啊？

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