A.變窄
B.變寬
C.不變
D.不能確定
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A.要寬
B.要窄
C.相同
D.可能寬也可能窄
A.正態(tài)分布
B.只有當(dāng)n<30時(shí),為正態(tài)分布
C.只有當(dāng)n≥30時(shí),為正態(tài)分布
D.非正態(tài)分布
A.足夠大時(shí)
B.足夠小時(shí)
C.無(wú)論大與小
D.無(wú)法判斷
A.隨機(jī)誤差
B.抽樣框誤差
C.回答誤差
D.無(wú)回答誤差
五位部門(mén)經(jīng)理的年收入如表:要描述五位部門(mén)經(jīng)理的年收入的一般水平,()來(lái)測(cè)度這一集中趨勢(shì)比較合適。
A.眾數(shù)
B.中位數(shù)
C.平均數(shù)
D.極差
最新試題
One advantage of a stem and leaf plot over a frequency distribution is that ().
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過(guò)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?
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)()
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?()
A summary measure that is computed from a sample to describe a characteristic of the population is called()
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
One rule that must always be followed in constructing frequency distributions is that ().
變量數(shù)列中,各組頻率之和應(yīng)()
對(duì)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()
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()