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，在大樣本情形下近似服從標(biāo)準(zhǔn)正態(tài)分布.
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)，并想通過廣告費(fèi)用對月銷售額作出估計(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
最新試題
If the individual class frequency is divided by the total frequency, the result is the （）.
某班的學(xué)習(xí)按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）
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？（）
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). The average number of absences per employee, calculated from the personnel data of all employees, is a （）.
The number of class intervals in a frequency distribution is usually between （）.
A cumulative frequency distribution would provide（）.
如果居民按報(bào)告期價(jià)格購買商品需多支出40萬元，報(bào)告期商品銷售額為200萬元，則價(jià)格指數(shù)為（）
在組距數(shù)列中，下限就是（）
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過四個(gè)車間，這四個(gè)車間的廢品率分別為1.5%、2.0%、2.0%和1.0%。該企業(yè)生產(chǎn)這種產(chǎn)品的平均廢品率是多少？
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？（）