| 3 | 1/1 | 返回列表 |
| 查看: 631 | 回復(fù): 2 | |||||
kandly銀蟲 (小有名氣)
|
[求助]
不重復(fù)抽檢問題 已有1人參與
|
| 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)
![]() |
專家經(jīng)驗(yàn): +342 |
|
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)
![]() |
專家經(jīng)驗(yàn): +518 |
| 3 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 化學(xué)308分調(diào)劑 +14 | 你好明天你好 2026-03-30 | 15/750 |
|
|---|---|---|---|---|
|
[考研] 08工科求調(diào)劑290分 +5 | 1314捧花 2026-04-02 | 8/400 |
|
|
[考研] 311求調(diào)劑 +14 | 藍(lán)月亮亮 2026-03-30 | 14/700 |
|
|
[考研] 354求調(diào)劑 +4 | lxb598 2026-03-31 | 5/250 |
|
|
[考研] 一志愿北交大材料工程,總分358 +4 | cs0106 2026-04-01 | 4/200 |
|
|
[考研] 材料求調(diào)劑 +8 | 呢呢妮妮 2026-04-01 | 8/400 |
|
|
[考研] 291求調(diào)劑 +20 | Y-cap 2026-03-29 | 25/1250 |
|
|
[考博] 26年申博 +3 | staryer 2026-03-30 | 4/200 |
|
|
[考研] 0710生物學(xué)考研調(diào)劑 +3 | 李多米lee. 2026-03-27 | 4/200 |
|
|
[考研] 350求調(diào)劑 +7 | 阿佳~ 2026-03-31 | 7/350 |
|
|
[考研] 283求調(diào)劑 +9 | A child 2026-03-28 | 9/450 |
|
|
[考研] 322求調(diào)劑 +8 | 三水sss 2026-04-01 | 8/400 |
|
|
[考研] 一志愿:西北大學(xué),英一數(shù)一408-284分求調(diào)劑 +7 | 12.27 2026-03-27 | 7/350 |
|
|
[考研] 材料與化工272求調(diào)劑 +25 | 阿斯蒂芬2004 2026-03-28 | 25/1250 |
|
|
[考研] 353求調(diào)劑 +3 | 江上楓_26 2026-03-28 | 3/150 |
|
|
[考研] 289求調(diào)劑 +3 | Acesczlo 2026-03-29 | 4/200 |
|
|
[考研] 南京大學(xué)化學(xué)調(diào)劑 +11 | 景隨風(fēng) 2026-03-29 | 16/800 |
|
|
[考研] 322求調(diào)劑 +10 | 宋明欣 2026-03-27 | 10/500 |
|
|
[考研] 求佛 +7 | 迷人的哈哈 2026-03-28 | 7/350 |
|
|
[考研] 312,生物學(xué)求調(diào)劑 +3 | 小譯同學(xué)abc 2026-03-28 | 3/150 |
|