A.0.19
B.0.81
C.0.6561
D.0.9
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A.直线趋势
B.曲线趋势
C.异方差
D.异常数据
使用最小二乘法估计得出的样本回归直线必然通过点()
A.(0,0)
B.(x,0)
C.(0,y)
D.(x,y)
A.y和x都是随机变量
B.y是随机变量,x是确定性变量
C.y是确定性变量,x是随机变量
D.y和x都是确定性变量
A.属性化
B.数量化
C.同质化
D.差异化
A.等于0
B.等于总平方和
C.完全由观测的随机误差引起
D.完全由各因子水平的差异引起
A.必然事件
B.不可能事件
C.小概率事件
D.大概率事件
A.原假设为真的条件下检验统计量的概率分布
B.备择假设为真的条件下检验统计量的概率分布
C.观测变量的总体概率分布
D.观测变量的样本分布
A.α
B.β
C.1-α
D.1-β
A.θ^的数值接近于总体参数θ
B.θ^的期望等于总体参数θ
C.θ^的方差接近于总体参数θ
D.θ^的方差接近于总体方差σ2
A.近似等于θ的量
B.随机变量
C.数学期望等于θ的统计量
D.方差固定的统计量
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Which of the following statements is not true?()
One rule that must always be followed in constructing frequency distributions is that ().
最能反映离散程度的指标是()
要了解某地区全部大学生的就业情况,那么()
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