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假設檢驗中拒絕域為()
A.Z<-1.96
B.Z>1.96
C.Z>1.65
D.Z<-1.65
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。下表給出了相關的分析結果,
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
A.組間平方和除以組內平方和
B.組內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均方
A.(1.645,1.96)
B.(0.40,0.50)
C.(0.45,0.55)
D.(0.419,0.481)
最新試題
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the cumulative frequency of the third class?()
某企業(yè)2018年技術工占50%,2019年新招收了一批學徒工,使學徒工的比重增加了10%。假定全廠各級工資水平均無變化,則2019年職工總平均工資將()
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
A summary measure that is computed from a sample to describe a characteristic of the population is called()
某企業(yè)的生產計劃完成百分比采用如下分組,請指出哪項是正確的()
If the individual class frequency is divided by the total frequency, the result is the ().
A cumulative frequency polygon is also called ().
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the approximate range of the number of phone calls arriving each hour?()
品合格率指標是()
如果居民按報告期價格購買商品需多支出40萬元,報告期商品銷售額為200萬元,則價格指數(shù)為()