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Chapter 12

Chapter 12. Estimation 統計估計. Inferential statistics Parametric statistics 母數統計 ( 母體為常態或大樣本 ) 假設檢定 hypothesis testing 對有關母體參數的假設，利用樣本資料，決定接受或不接受該假設的方法 統計估計 statistical estimation 利用樣本統計量去推估母體參數的辦法 Nonparametric statistics 無母數統計 ( 母體非為常態或小樣本 ). 請問我们的統計課本有多重？. 統計估計.

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Chapter 12

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  1. Chapter 12 Estimation 統計估計

  2. Inferential statistics • Parametric statistics 母數統計 (母體為常態或大樣本) • 假設檢定 hypothesis testing • 對有關母體參數的假設，利用樣本資料，決定接受或不接受該假設的方法 • 統計估計 statistical estimation • 利用樣本統計量去推估母體參數的辦法 • Nonparametric statistics 無母數統計(母體非為常態或小樣本)

  3. 請問我们的統計課本有多重？

  4. 統計估計 • POINT ESTIMATION 點估計 • 樣本統計量( ) 母體參數(µ) • Precise but less confident • 最佳的點估計位置為？__________ • 限制 • INTERVAL ESTIMATION區間估計 • 對未知的母體參數(µ)估計一個有上下限的區間，並指出該區間包含母體參數的可靠度 • Upper limit • Lower limit • Confidence level • Confidence interval 信賴區間 • 在一既定的信賴水準下所構成的區間

  5. exercise 預估台灣地區大學生平均體重，隨機抽樣100位學生得知平均體重為62公斤，樣本標準差為9公斤。試問在95%信賴水準下，母體平均數的信賴區間為何?

  6. Two ways to Control the width of interval estimates • Confidence level/ •  , interval width (區間寬度)  • Confidence level  , interval width  • Sample size (n) • n , interval width (區間寬度) 

  7. 某GM 欲知與業務員清楚溝通業績表現期望(performance expectation)是否會促進業績銷售，所以此GM進行一項實驗。GM會在與第一組業務員(n=60)開會時明白告訴他們銷售目標但不與第二組的業務員(n=80)說明銷售目標。在第一季之後此GM比較這兩組之業績表現(如下)。Find the 95% confidence interval for (1 -2 ) Group 1 (實驗組) n1=60 平均值=16.5 標準差=201.6 Group 2 (控制組) n1=80 平均值=7.0 標準差=171.8

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