A.各個(gè)個(gè)體的名稱與指標(biāo)數(shù)值
B.各組變量值與次數(shù)
C.各組變量值與其方差
D.各組均值與方差
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A.簡(jiǎn)單隨機(jī)抽樣
B.系統(tǒng)抽樣
C.分層抽樣
D.整群抽樣
A.必須相同
B.必須不同
C.可以相同,也可以不同
D.完全沒有關(guān)系
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最新試題
Which of the following is not the goal of descriptive statistics?()
The number of class intervals in a frequency distribution is usually between ().
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?()
時(shí)間序列構(gòu)成因素有哪些?分解的基本原理和思路是什么?
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
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()
One advantage of a stem and leaf plot over a frequency distribution is that ().
要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()
某廠某年職工勞動(dòng)生產(chǎn)率為20000元,是歷史最高水平的1.2倍。這里的1.2倍是()
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()