A.θ^的數(shù)值接近于總體參數(shù)θ
B.θ^的期望等于總體參數(shù)θ
C.θ^的方差接近于總體參數(shù)θ
D.θ^的方差接近于總體方差σ2
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A.近似等于θ的量
B.隨機變量
C.數(shù)學期望等于θ的統(tǒng)計量
D.方差固定的統(tǒng)計量
A.正態(tài)分布
B.x2分布
C.t分布
D.均勻分布
A.一致性
B.無偏性
C.有效性
D.充分性
A.變量x的標準差
B.變量y的標準差
C.變量x和y兩個標準差的乘積
D.變量x和y的協(xié)方差
A.平均差大于標準差
B.平均差小于標準差
C.平均差等于標準差
D.二者關系不定
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