某汽車生產(chǎn)商欲了解廣告費(fèi)用X對(duì)銷售量Y的影響,收集了過(guò)去12年的有關(guān)數(shù)據(jù)。通過(guò)計(jì)算得到下面的有關(guān)結(jié)果:
解釋回歸系數(shù)的實(shí)際意義。您可能感興趣的試卷
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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(wú)變化,則2019年職工總平均工資將()
對(duì)全國(guó)各鐵路交通樞紐的貨運(yùn)量、貨物種類等進(jìn)行調(diào)查,以了解全國(guó)鐵路貨運(yùn)概況。這種調(diào)查屬于()
在組距數(shù)列中,下限就是()
以2000年a0為最初水平,2016年an為最末水平,計(jì)算鋼產(chǎn)量的年平均發(fā)展速度時(shí),須開(kāi)()
One advantage of a stem and leaf plot over a frequency distribution is that ().
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?()
某班的學(xué)習(xí)按考試成績(jī)分為60分以下,60-70,70-80,80-90,90-100,這種分組()
Which of the following is not the goal of descriptive statistics?()
If the individual class frequency is divided by the total frequency, the result is the ().
變量數(shù)列中,各組頻率之和應(yīng)()