多項(xiàng)選擇題根據(jù)線性回歸分析的基本假定,因變量的觀測(cè)值必須()

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


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2.多項(xiàng)選擇題在方差分析的數(shù)據(jù)結(jié)構(gòu)模型中,需假設(shè)隨機(jī)誤差ε()

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

3.多項(xiàng)選擇題進(jìn)行假設(shè)檢驗(yàn)時(shí),如果要增加檢驗(yàn)的功效,則可以采用的方式有()

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

4.多項(xiàng)選擇題在假設(shè)檢驗(yàn)中,對(duì)于給定的顯著性水平,如果要計(jì)算發(fā)生第二類錯(cuò)誤的概率,則必須有() 

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

5.多項(xiàng)選擇題對(duì)于某個(gè)樣本估計(jì)量來說,影響其標(biāo)準(zhǔn)誤的因素主要有()

A.總體中各個(gè)個(gè)體之間的差異程度
B.樣本容量的大小
C.總體中個(gè)體數(shù)的多少
D.樣本的抽取方式
E.抽樣調(diào)查中登記誤差的大小

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