A.客觀環(huán)境的可能狀態(tài)集
B.決策者的可行行動集
C.決策行動的收益函數(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的高次項對y的影響
E.模型參數(shù)估計的錯誤
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.不同次觀測相互獨立
E.與自變量的取值相互獨立
最新試題
對某班級學(xué)生的生活狀況進(jìn)行統(tǒng)計調(diào)查，下列標(biāo)志中屬于不變標(biāo)志的是（）
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？（）
The number of class intervals in a frequency distribution is usually between （）.
One rule that must always be followed in constructing frequency distributions is that （）.
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 （）.
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過四個車間，這四個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？
One advantage of a stem and leaf plot over a frequency distribution is that （）.
A cumulative frequency polygon is also called （）.
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
Descriptive statistics deals with methods of（）