宇同學
2023-01-01 21:07Find the reliability factors based on the t-distribution for the following confidence intervals for the population mean (df = degrees of freedom, n = sample size): A.A 99% confidence interval, df = 20 A 90% confidence interval, df = 20 C. A 95% confidence interval, n = 25 D. A 95% confidence interval, n = 16 A. For a 99% confidence interval, the reliability factor we use is t0.005; for df = 20, this factor is 2.845. B. For a 90% confidence interval, the reliability factor we use is t0.05; for df = 20, this factor is 1.725. C. Degrees of freedom equals n ? 1, or in this case 25 ? 1 = 24. For a 95% confidence interval, the reliability factor we use is t0.025; for df = 24, this factor is 2.064. D. Degrees of freedom equals 16 ? 1 = 15. For a 95% confidence interval, the reliability factor we use is t0.025; for df = 15, this factor is 2.13 課后答案中的t0.005 t0.05 t.0.025 t0.025這幾個數(shù)是怎么來的？
所屬：CFA Level I > Quantitative Methods 視頻位置 相關(guān)試題
來源： 視頻位置 相關(guān)試題
1個回答
Evian, CFA助教
2023-01-03 12:04
該回答已被題主采納
ヾ(?°?°?)??你好同學，
請參考P496的t學生分布表，以A為例，df=20，單尾概率0.5%（1-99%之后除以2；t學生分布表的第一行p表示單尾概率），對應查表（critical value關(guān)鍵值）數(shù)值為2.845
題目中“confidence interval”置信區(qū)間這個信息可以推出拒絕域在雙尾。
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