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[問題] 96年初考
Dec 31st 2013, 18:11, by helenpei

作者helenpei (狗狗)

看板Examination

標題[問題] 96年初考

時間Tue Dec 31 18:11:38 2013

[問題] 應考資格、各種國考疑難雜症等,以有正確作法、答案者為主 (不包括書裡的疑問)。若問題如人生規劃、讀書計畫等,無一 定作法、答案者,請用閒聊選項。 第四十題 假設{X1,X2,X3,.....X10}是一個抽自常態母體的隨機樣本, 若母體標準差已知為σ ,另XBAR代表樣本平均數,今預建立X11的預測區間(L,U),使得P(L※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 124.8.137.214

wsp14679:XBAR-X11~N(0,σ^2 x (1+1/N))~ 12/31 18:20

wsp14679:P(-1.96<= (XBAR-X11)/σx (1+1/N)^0.5 <= 1.96)=95% 12/31 18:22

wsp14679:移項得 P(XBAR-1.96*(1+1/N)^0.5*σ<= 12/31 18:24

wsp14679:X11<=XBAR+1.96*(1+1/N)^0.5*σ)=95% ~~將N=10帶入 12/31 18:25

wsp14679:得1.1^0.5 12/31 18:25

wsp14679:補充:X11~N(u,變異數),Xbar~N(u,變異數/n) 12/31 18:33

wsp14679:其中,n=樣本數 12/31 18:33

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