統計過程控製（SPC）及過程能力(ppt 106頁)

統計過程控製（SPC）及過程能力目錄：
1、SPC的發展史
2、基本統計概念
3、過程變差
4、控製圖
5、過程控製和過程能力

統計過程控製（SPC）及過程能力內容提要：
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 中位數（median）：
將總體單位數量標誌的各個數值按照大小順序排列，居於中間位置的那個數值稱為中位數。
當資料項數n為奇數，數列中隻有一個居中的標誌值，該標誌值就是中位數。
當n為偶數時，數列中有兩個居中的標誌值，中位數便是中間兩個標誌值的簡單算術平均數。

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