单项选择题

一家电器销售公司的管理人员认为,每月的销售额是广告费用的函数,并想通过广告费用对月销售额作出估计。用电视广告费用作自变量,销售额作因变量进行回归分析。下表给出了相关的分析结果,

下列说法正确的是()

A.广告费用每增加$1,000, 销售额增加$1.420 211
B.广告费用每增加$1,000, 销售额增加$1420. 211
C.广告费用每增加$1420.211, 销售额增加$1000
D.广告费用每增加$1, 销售额增加$363.689 1


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1.单项选择题在方差分析中,检验统计量F是()

A.组间平方和除以组内平方和
B.组内均方和除以组间均方
C.组间平方和除以总平方和
D.组间均方和除以组内均方

2.单项选择题采取随机抽样抽取1000人,其中有450人支持候选人A,那么支持候选人A的置信度为95%的置信区间为:()

A.(1.645,1.96)
B.(0.40,0.50)
C.(0.45,0.55)
D.(0.419,0.481)

3.单项选择题关于F分布的说法,哪个是正确的() 

A.F0.05,10,20 = 1/F0.95,10,20
B.F0.05,10,20 = 1/F0.05,20,10
C.F0.95,10,20 = 1/F0.95,20,10
D.F0.95,10,20 = 1/F0.05,20,10

4.单项选择题关于假设检验的两类错误,下列说法不正确的有()

A.第一类错误被称为弃真错误
B.第一类错误被称为纳伪错误
C.第二类错误是原假设不正确,但却被接受的错误
D.第一类错误是原假设正确,但却被拒绝的错误

7.单项选择题所有可能实验结果的集合被称为一个()

A.样本空间
B.事件
C.实验
D.概率

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