劉同學
2024-07-22 21:10A population has a non-normal distribution with mean µ and variance σ2. The sampling distribution of the sample mean computed from samples of large size from that population will have:A.the same distribution as the population distribution.B.its mean approximately equal to the population mean.C.its variance approximately equal to the population variance.為啥A不對,大樣本不是可以看成正態(tài)嗎,為什么b對c不對
所屬:CFA Level I > 數(shù)量+金融計算器前導 視頻位置 相關試題
來源: 視頻位置 相關試題
1個回答
葛王璐助教
2024-08-14 21:25
該回答已被題主采納
同學你好,本題是針對樣本均值的考察,
A選項:根據(jù)中心極限定理,當樣本容量較大時,樣本均值的抽樣分布近似正態(tài)分布,而population是non-normal的,所以不是same distribution;
B選項:樣本均值作為一個隨機變量服從正態(tài)分布,其均值近似等于總體均值μ,表述正確;
C選項:樣本均值的standard deviation = 總體標準差σ/根號n
