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kandly銀蟲 (小有名氣)
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[求助]
不重復(fù)抽檢問題 已有1人參與
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| 各位師兄師姐,小弟有一事不明,我們是做膜片的,膜片的檢測(cè)是通過在一大張膜上面剪一小塊膜,來測(cè)試它的性能,但是我又不能將整張膜都剪成小塊來測(cè)試,那么這張膜就沒用了。我們現(xiàn)在的方法是在一整張膜片上盡量隨機(jī)多取樣品,有沒有一個(gè)公式什么的,能夠?qū)⑽宜颖玖、總樣本量和合格率之間聯(lián)系起來。就類似總共有1000個(gè)成品,我不重復(fù)地隨機(jī)取了100個(gè)做測(cè)試,若是這100個(gè)都合格了,那么這1000個(gè)產(chǎn)品合格的概率是多少? |

專家顧問 (著名寫手)
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專家經(jīng)驗(yàn): +342 |
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This seems complicated. For the example you gave, the random variables are assumed to be i.i.d. In fact, they are not. For your case, it's more complicated. If you choose 10 pieces from the same membrane, can we assume these 10 random variables subject to the same distribution? Maybe not since they are from the same membrane but from different positions. It's obvious they are not independent, but we can assume they are independent. If you have 1000 pieces of same membrane, you may cut the same position and get 1000 small pieces. These 1000 small pieces are possibly treated as i.i.d. Then you can employ methods from statisticas to estimate. However, the 1000 pieces of membrane will have holes on each of them. ![]() ![]() ![]() ![]() ![]() ![]() ![]() |

榮譽(yù)版主 (文壇精英)
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專家經(jīng)驗(yàn): +518 |
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