批踢踢實業坊 Examination 板: [課業] 生物統計學-共變異數－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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批踢踢實業坊 Examination 板

[課業] 生物統計學-共變異數

Jul 3rd 2013, 17:51, by Terrn

作者Terrn (倪福德加油!!!!)

看板Examination

標題[課業] 生物統計學-共變異數

時間Wed Jul 3 17:51:56 2013

[課業] 國考課業相關問題，非歷屆考題的討論，如學理觀念的釐清。題目如下: 1. 都市國中三年級學生之一百名隨機樣本中,55名為近視,山地國中三年級學生之一百名隨機樣本中,15名為近視,則都市國中與山地國中三年級學生近視比率差別的 95%信賴區間為何? 其標準誤差採用 0.55*0.45/100 + 0.15*0.85/100 再開根號 2. 1954年洛杉磯在某喜宴之後發生傷寒,有吃鴨子這一道菜共計86人, 其中11人生病沒吃的132人中,沒有人生病,則此兩種人疾病發生率是否不同? 其標準誤差採用 0.95*0.05/86 + 0.95*0.05/132 再開根號我不解的地方為題目1的標準誤差並無採用共變異數下去做計算, 而題目2卻採用共變異數的方式計算, 不知道這其中的差別是在哪裡? 謝謝幫忙解惑的大大~ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.125.41.80 ※ 編輯: Terrn 來自: 140.125.41.80 (07/03 17:53)

推 goshfju:共變異數??? 07/03 17:59

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