待估参数条件2统 计 量双侧置信区间单侧置信下(上)限Xσ已知均值μσ未知一个总体20~N(0,1)nX2,X2nnSSXt2(n1),Xt2(n1)nn2X2X2nn分布表自由度正态表X~t(n1)SnXt(n1)2SnSnχ2分布表t分布表n-1Xt(n1)2μ已知方差σ212(Xi1ni)~(n)2n(Xi)χ2α22i1(n)2(X)i,i12χ1α(n)2n(Xi1ni2)2/χ(n)(Xi1nni)/χ221(n)μ未知n121n22S(XX)~(n1)i2200i1XY(12)~N(0,1)2(n1)S2(n1)S,22χα(n1)χ1α(n1)2222(XY)1/n12/n2,2(n1)S2/χ(n1)(n1)S/χ1(n1)2(XY)12/n12/n222χ分布表2n-1均值差μ1-μ2σ1,σ2均已知21n122n22(XY)12/n12/n22(XY)/n1/n222122正态表XY(12)nSnSn1n2n1n22n1n2两个总体均值差μ1-μ2σ1,σ2均未知但σ1=σ2211222~t(n1n22)(XY)t(n1n22)Sw1/n11/n2,2(XY)t(n1n22)Sw1/n11/n22XY(12)~t(n1n22)11Swn1n222(n1)S(n1)S2122Sw1n1n22(XY)t(n1n22)Sw1/n11/n2(XY)t(n1n22)Sw1/n11/n222t分布表n1+n2-2方差比σ12/σ22μ1,μ2均未知S12/12~F(n11,n21)22S2/21S12S122,F(n11,n21)22S2F(n11,n21)S221S122F(n11,n21)S22S12F(n11,n21)22S2F表n1-1,n2-1σ1/σ222
12
均未知S12F(n11,n21)22S2表
1-1,n2-1
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