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第42章 天大地大(1 / 2)

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“很好,那就表示我们的抽样方案都错了,出错的机率是50%以上。”

陆晨风继续开口称赞,嘴唇带着笑意,然而目光清冷,张着一口白牙,给人阴森恐怖的感觉:

“我现在总算是明白了为什么你们控制的一塌糊涂,出现那么多品质事故。”

“过来,我告诉你这个方案应该怎么抽样。”

陆晨风把姜菁华叫到身边,取下墙壁上的抽样方案,介绍道:

“知道你们错在哪吗,就是B类。”

“因为我们的AQL值是A类0.65,B类——也就是一般类的是1.0,轻微是1.5。轻微没有多大关系,但是A类和B类往往冲突。

“批量在281以上,抽样没有错误,但是批量低于281,那么你们完全错了!”

他指着方案上相应的范围:

“你看看低于281的这些批量,0.65和1.0的AQL值是不是从来没有在一条直线上?”

陆晨风认真的解释道:

“抽样计划由一个或者多个抽样方案组成,抽样方案是样本量、接收数和拒收数的组合,也就是说每一组接收数和拒收数都有一个对应的样本量。”

“我们有三个AQL值,那就代表有三个抽样方案,有三组接收数和拒收数,理论上就有三个样本量。

“只有三个AQL值在同一条直线上,那么它们才是同一个样本量,也就是说它们的样本数量是一致。

“但是0.65和1.0的AQL值,批量低于281的时候,它的接收数和拒收数从来不在一条直线上,也就是至少必须有两个样本量,不同的样本数量。”

“明白吗,就像这个。”陆晨风手指着一行,手把手的教导,道:

“151-280,根据AQL值A类0.65的抽样标准是20个,接收数和拒收数的判定标准是0收1退,但是B类1.0的判定标准是1收2退。”

“这意味着什么?”陆晨风指着抽样方案AQL值1.0栏目下的1收2退栏对应的样本数,自问自答,摇头说道::

“这表示我们没有抽取足够的样本量,它应该是抽50个,而不是20个。

“20个样本量的1收2退和50个样本量的1收2退,那完全是两个概念,误差率超过100%!”

姜菁华色唰的一下脸色就白了,手足无措,呼吸急促:

“我,我们一直都是这样的。”

陆晨风将抽样方案塞到姜菁华手里,沉重的深深吸过一口气,轻叹:

“我知道,所以你们一直在错误!”

看着姜菁华还在犹豫,似乎不相信他所言,他又摇头苦笑:

“我也希望我是错的,但是我的管理水平比一般人要高,而且这是很明显的错误,我想错也错不了。

“按照我说的去做吧,把我们的人员培训一下。

“你需要记住的是:AQL值栏的每一个判定数据,对应的是一个单独的抽样方案,有一个单独的样本数量,而不是先确定样本数量,再在表上寻找相对应的判定数据,这是错误的操作。”

“换句话来说,就是判定数据在变,前面的样本量也要跟着变,样本量、判定数据是一组有机组合,你不能抽测20个样本,却采用50个样本量的判定数据,这完全是错误。

“如果AQL值数量不在同一条直线,那就意味着它至少有两个样本量,明白吗?”

“明白。”姜菁华点头。

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