A.定基发展速度大致相等
B.环比发展速度大致相等
C.逐期增长量大致相等
D.二级增长量大致相等
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A.直线趋势模型
B.指数曲线趋势模型
C.二次曲线趋势模型
D.修正指数曲线趋势模型
A.算术平均法
B.几何平均法
C.代数平均法
D.调和平均法
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
最新试题
A cumulative frequency polygon is also called ().
什么是季节变动?研究它的意义何在?如何测定季节变动?
Descriptive statistics deals with methods of()
某厂某年职工劳动生产率为20000元,是历史最高水平的1.2倍。这里的1.2倍是()
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the approximate range of the number of phone calls arriving each hour?()
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()
A cumulative frequency distribution would provide().
If the individual class frequency is divided by the total frequency, the result is the ().