A.客觀環(huán)境的可能狀態(tài)集
B.決策者的可行行動(dòng)集
C.決策行動(dòng)的收益函數(shù)
D.決策樹
E.決策者
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A.環(huán)比法
B.定基法
C.方程法
D.算術(shù)平均法
E.幾何平均法
A.指數(shù)曲線趨勢模型
B.修正指數(shù)曲線趨勢模型
C.邏輯曲線趨勢模型
D.龔配茨曲線趨勢模型
E.雙指數(shù)曲線趨勢模型
A.R2=SSR/SST
B.R2=SSE/SST
C.R2=1-SSR/SST
D.R2=1-SSE/SST
E.R2=1-SSR/(SSR+SSE)
在y對x是線性回歸模型
中，隨機(jī)誤差u產(chǎn)生的原因有（）
A.各種細(xì)小的偶然因素
B.對y的觀測誤差
C.對x的觀測誤差
D.x的高次項(xiàng)對y的影響
E.模型參數(shù)估計(jì)的錯(cuò)誤
A.數(shù)學(xué)期望為0
B.具有相同的方差
C.服從正態(tài)分布
D.不同次觀測相互獨(dú)立
E.與自變量的取值相互獨(dú)立
最新試題
某廠某年職工勞動(dòng)生產(chǎn)率為20000元，是歷史最高水平的1.2倍。這里的1.2倍是（）
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？（）
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 cumulative frequency of the third class？（）
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
常用的長期趨勢測定的方法有哪些？各有什么特點(diǎn)？
The number of class intervals in a frequency distribution is usually between （）.
變量數(shù)列中，各組頻率之和應(yīng)（）
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過四個(gè)車間，這四個(gè)車間的廢品率分別為1.5%、2.0%、2.0%和1.0%。該企業(yè)生產(chǎn)這種產(chǎn)品的平均廢品率是多少？
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 （）.