[考題] 抽樣方法(100高考):－2016徵求年菜推薦網路訂購最紅的商家.年菜訂購?台北年菜外送餐廳推薦(年菜)?年菜.今年不想做年菜推薦,網路宅配哪一家好?

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[考題] 抽樣方法(100高考)

Sep 5th 2013, 13:36, by Rotman

作者Rotman (感情與願望是努力的動力)

看板Examination

標題[考題] 抽樣方法(100高考)

時間Thu Sep 5 13:36:49 2013

100年高考第一大題中,有幾個問題想請教: (1)為何Y1必須相對非常小? (2)在求期望值時為何不能直接求E(y1_bar_)而須透過雙重期望值來算? 謝謝 -- 一個人澈悟的程度恰等于他所受痛苦的深度 ~~林語堂 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 59.120.241.229

推 folksuite:(1)題目規定...所以y1_bar含y1時要加a...以做調整 09/05 13:50

→ folksuite:(2)y1_bar受y1控制。E(y1_bar)=EE(y1_bar│y1) 09/05 13:54

→ Rotman:我的意思是說Y1值若沒太小,會有怎樣問題產生? 09/05 13:55

※ 編輯: Rotman 來自: 59.120.241.229 (09/05 13:55)

→ Rotman:(2)我懂了...是我自己忘記條件期望值的定義.謝謝你唷! 09/05 13:56

→ folksuite:y1若沒太小 → 含y1時就不用+a → 這題就沒可考性了 09/05 14:01

→ folksuite:我是這樣覺得啦!當然我也可以改成 09/05 14:01

→ folksuite:yn很大 → 含yn時就要-a → 新的一題= =... 09/05 14:02

→ Rotman:有哪裡文獻可供我參考嗎?雖然會算,不是很懂他這樣定義法 09/05 14:07

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