在y對x是線性回歸模型中,隨機誤差u產(chǎn)生的原因有()
A.各種細小的偶然因素
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
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A.數(shù)學期望為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
A.1次
B.2次
C.3次
D.4次
E.5次
A.數(shù)學期望為0
B.相互獨立
C.方差為常數(shù)
D.方差隨因子水平的增減而增減
E.服從正態(tài)分布
A.加大顯著性水平
B.減小顯著性水平
C.加大樣本容量
D.減小樣本容量
E.使用精確分布
A.原假設(shè)是精確假設(shè)
B.備擇假設(shè)是精確假設(shè)
C.原假設(shè)是非精確假設(shè)
D.備擇假設(shè)是非精確假設(shè)
E.樣本給定
最新試題
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). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50 employees is a ().
以2000年a0為最初水平,2016年an為最末水平,計算鋼產(chǎn)量的年平均發(fā)展速度時,須開()
品合格率指標是()
時間序列構(gòu)成因素有哪些?分解的基本原理和思路是什么?
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?()
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?
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)()
對某班級學生的生活狀況進行統(tǒng)計調(diào)查,下列標志中屬于不變標志的是()
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?()