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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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)
D.(0.419,0.481)
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
A.2.14
B.5.66
C.7.28
D.15
最新試題
A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of ().
Descriptive statistics deals with methods of()
在組距數(shù)列中,下限就是()
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()
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50 employees is a ().
一個地區(qū)一定時期的商品零售額屬于()
A summary measure that is computed from a sample to describe a characteristic of the population is called()
以2000年a0為最初水平,2016年an為最末水平,計算鋼產(chǎn)量的年平均發(fā)展速度時,須開()
Which of the following is not the goal of descriptive statistics?()
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?()