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(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
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
在組距數(shù)列中,下限就是()
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 ().
某班的學(xué)習(xí)按考試成績分為60分以下,60-70,70-80,80-90,90-100,這種分組()
The number of class intervals in a frequency distribution is usually between ().
A cumulative frequency polygon is also called ().
變量數(shù)列中,各組頻率之和應(yīng)()
One rule that must always be followed in constructing frequency distributions is that ().
一個地區(qū)一定時期的商品零售額屬于()
某廠某年職工勞動生產(chǎn)率為20000元,是歷史最高水平的1.2倍。這里的1.2倍是()
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 ().