A.算术平均法
B.几何平均法
C.代数平均法
D.调和平均法
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A.时点序列
B.时期序列
C.特征序列
D.平稳序列
A.0.19
B.0.81
C.0.6561
D.0.9
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
最新试题
Which of the following statements is not true?()
Which of the following is best to show the percentage of a total budget that is spent on each category of items?()
变量数列中,各组频率之和应()
A cumulative frequency distribution would provide().
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). The average number of absences per employee, calculated from the personnel data of all employees, is a ().
什么是季节变动?研究它的意义何在?如何测定季节变动?
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
一个地区一定时期的商品零售额属于()
One advantage of a stem and leaf plot over a frequency distribution is that ().
The number of class intervals in a frequency distribution is usually between ().