5 30z Mc GrawHill Irwin The Mc GrawHill
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5 點估計與信賴區間 若母體標準差已知,且樣本大小大 於 30,我們使用z 分配。 Mc. Graw-Hill/ Irwin © The Mc. Graw-Hill Companies, Inc. , 2003 All Rights Reserved.
6 點估計與信賴區間 若母體標準差已知,且樣本大小小 於 30,我們使用 t 分配。 Mc. Graw-Hill/ Irwin © The Mc. Graw-Hill Companies, Inc. , 2003 All Rights Reserved.
10 樣本平均數的標準誤 樣本平均數抽樣分配的標準差可稱為 「標準誤」(Standard error)。 Mc. Graw-Hill/ Irwin © The Mc. Graw-Hill Companies, Inc. , 2003 All Rights Reserved.
13 µ 的95% 與 99% 信賴區間 母體平均數的95%信賴區間為: Mc. Graw-Hill/ Irwin © The Mc. Graw-Hill Companies, Inc. , 2003 All Rights Reserved.
14 µ 的95% 與 99% 信賴區間 母體平均數的99% CI 為: Mc. Graw-Hill/ Irwin © The Mc. Graw-Hill Companies, Inc. , 2003 All Rights Reserved.
15 建構µ 的通用信賴區間 平均數信賴區間的通用計算公式為 : Mc. Graw-Hill/ Irwin © The Mc. Graw-Hill Companies, Inc. , 2003 All Rights Reserved.
17 範例 3 母體平均數未知,因此最佳估計量 為 樣本平均數 24. 0小時。此稱為點估計 。 Mc. Graw-Hill/ Irwin © The Mc. Graw-Hill Companies, Inc. , 2003 All Rights Reserved.
18 範例 3 continued 計算母體平均數之95%信賴區間: Ø 信賴界限的範圍是從 22. 88 到 25. 12間。 此區間約涵蓋 95 % p 的母體母數。 Mc. Graw-Hill/ Irwin © The Mc. Graw-Hill Companies, Inc. , 2003 All Rights Reserved.
19 母體比例的信賴區間 母體比例信賴區間的估計公式為: Mc. Graw-Hill/ Irwin © The Mc. Graw-Hill Companies, Inc. , 2003 All Rights Reserved.
22 有限母體的校正因子 樣本平均數的標準誤: Mc. Graw-Hill/ Irwin © The Mc. Graw-Hill Companies, Inc. , 2003 All Rights Reserved.
24 範例 5 依據範例 4,請建構每週學生 作的 平均時數,不過樣本為 500 位學生。 Mc. Graw-Hill/ Irwin © The Mc. Graw-Hill Companies, Inc. , 2003 All Rights Reserved.
25 範例 5 由於 n/N = 49/500 =. 098 大於 05 , 我們使用有限母體校正因子。 Mc. Graw-Hill/ Irwin © The Mc. Graw-Hill Companies, Inc. , 2003 All Rights Reserved.
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