在y對(duì)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(duì)y的觀測(cè)誤差
C.對(duì)x的觀測(cè)誤差
D.x的高次項(xiàng)對(duì)y的影響
E.模型參數(shù)估計(jì)的錯(cuò)誤
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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(cè)相互獨(dú)立
E.與自變量的取值相互獨(dú)立
A.1次
B.2次
C.3次
D.4次
E.5次
A.數(shù)學(xué)期望為0
B.相互獨(dú)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
品合格率指標(biāo)是()
一個(gè)地區(qū)一定時(shí)期的商品零售額屬于()
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?()
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
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 ().
時(shí)間序列構(gòu)成因素有哪些?分解的基本原理和思路是什么?
A cumulative frequency polygon is also called ().
對(duì)某班級(jí)學(xué)生的生活狀況進(jìn)行統(tǒng)計(jì)調(diào)查,下列標(biāo)志中屬于不變標(biāo)志的是()
常用的長(zhǎng)期趨勢(shì)測(cè)定的方法有哪些?各有什么特點(diǎn)?
變量數(shù)列中,各組頻率之和應(yīng)()