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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 data are grouped into intervals and the number of items in each group is listed, this could be called a （）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
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 （）.
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)？
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
對某班級(jí)學(xué)生的生活狀況進(jìn)行統(tǒng)計(jì)調(diào)查，下列標(biāo)志中屬于不變標(biāo)志的是（）
The number of class intervals in a frequency distribution is usually between （）.
某企業(yè)2018年技術(shù)工占50%，2019年新招收了一批學(xué)徒工，使學(xué)徒工的比重增加了10%。假定全廠各級(jí)工資水平均無變化，則2019年職工總平均工資將（）
Descriptive statistics deals with methods of（）