單項選擇題

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

下列說法正確的是()

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


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1.單項選擇題在方差分析中,檢驗統(tǒng)計量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.單項選擇題采取隨機抽樣抽取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.單項選擇題關(guān)于F分布的說法,哪個是正確的() 

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.單項選擇題關(guān)于假設(shè)檢驗的兩類錯誤,下列說法不正確的有()

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

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