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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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
A.(1.645,1.96)
B.(0.40,0.50)
C.(0.45,0.55)
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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
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
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為什么在計(jì)算平均指標(biāo)的基礎(chǔ)上還有必要進(jìn)一步計(jì)算變異指標(biāo)?
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