单项选择题现期与基期相比,某地粮食总产量增长了10%,粮食播种面积增长了5%,则粮食平均亩产量增长了()

A.0.5%
B.2%
C.4.8%
D.5%


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1.单项选择题由拉氏指数和派氏指数经过简单几何平均而得到的指数是()

A.杨格综合指数
B.马埃综合指数
C.费暄理想指数
D.平均指数

2.单项选择题在决策树中,引出各客观状态的是()

A.方案枝
B.状态枝
C.决策点
D.状态点

3.单项选择题若决策者按照对客观环境状态最乐观的设想寻求取得最大的收益,则他所采用的决策准则是()

A.大中取小原则
B.小中取大原则
C.大中取大原则
D.折中原则

6.单项选择题相关关系是变量之间一种()

A.线性函数依存关系
B.确定性的数量依存关系
C.非线性函数依存关系
D.非确定性的数量依存关系

7.单项选择题在方差分析中,各次试验观测应()

A.相互关联
B.互不相关
C.计量逐步精确
D.方法逐步改进

8.单项选择题如果原假设为H0:θ≥θ0,备则假设为H1:θ<θ0,则进行假设检验时应采用()

A.侧检验
B.左侧检验
C.双侧检验
D.上侧检验

9.单项选择题在关于总体参数的假设检验中,原假设必须是一个()

A.精确假设
B.非精确假设
C.复合假设
D.备择假设

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