單項(xiàng)選擇題

一家電器銷售公司的管理人員認(rèn)為,每月的銷售額是廣告費(fèi)用的函數(shù),并想通過(guò)廣告費(fèi)用對(duì)月銷售額作出估計(jì)。用電視廣告費(fèi)用作自變量,銷售額作因變量進(jìn)行回歸分析。下表給出了相關(guān)的分析結(jié)果,

下列說(shuō)法正確的是()

A.廣告費(fèi)用每增加$1,000, 銷售額增加$1.420 211
B.廣告費(fèi)用每增加$1,000, 銷售額增加$1420. 211
C.廣告費(fèi)用每增加$1420.211, 銷售額增加$1000
D.廣告費(fèi)用每增加$1, 銷售額增加$363.689 1


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1.單項(xiàng)選擇題在方差分析中,檢驗(yàn)統(tǒng)計(jì)量F是()

A.組間平方和除以組內(nèi)平方和
B.組內(nèi)均方和除以組間均方
C.組間平方和除以總平方和
D.組間均方和除以組內(nèi)均方

2.單項(xiàng)選擇題采取隨機(jī)抽樣抽取1000人,其中有450人支持候選人A,那么支持候選人A的置信度為95%的置信區(qū)間為:()

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

3.單項(xiàng)選擇題關(guān)于F分布的說(shuō)法,哪個(gè)是正確的() 

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.單項(xiàng)選擇題關(guān)于假設(shè)檢驗(yàn)的兩類錯(cuò)誤,下列說(shuō)法不正確的有()

A.第一類錯(cuò)誤被稱為棄真錯(cuò)誤
B.第一類錯(cuò)誤被稱為納偽錯(cuò)誤
C.第二類錯(cuò)誤是原假設(shè)不正確,但卻被接受的錯(cuò)誤
D.第一類錯(cuò)誤是原假設(shè)正確,但卻被拒絕的錯(cuò)誤

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