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统计过程控制(SPC)及过程能力(ppt 106页)

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统计过程控制,spc,过程能力
统计过程控制(SPC)及过程能力(ppt 106页)内容简介

统计过程控制(SPC)及过程能力目录:
1、SPC的发展史
2、基本统计概念
3、过程变差
4、控制图
5、过程控制和过程能力


统计过程控制(SPC)及过程能力内容提要:
Imagine for one brief moment that each of the one hundred and forty-one words of this paragraph is a separate component from a first run of fourteen-inch flywheels. You are one of five inspectors performing the final inspection of these finished components which were produced on fairly small dial index machines that are not being controlled by the use of statistical techniques. As can be expected from an operation of this nature , there are a number of defectives components being made .Each word that contains an f represents a defective component. How many of the defectives are you able to find? Check again and inspect for the present ’s off ’s. Write your final count in the bottom left hand corner of this page .This example should give you a fair idea of how reliable 100%inspection can be.
Md  中位数(median):
将总体单位数量标志的各个数值按照大小顺序排列,居于中间位置的那个数值称为中位数。
当资料项数n为奇数,数列中只有一个居中的标志值,该标志值就是中位数。
当n为偶数时,数列中有两个居中的标志值,中位数便是中间两个标志值的简单算术平均数。


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