A.變量x的標(biāo)準(zhǔn)差
B.變最y的標(biāo)準(zhǔn)差
C.變量x和y兩標(biāo)準(zhǔn)差的乘積
D.變量x和y的協(xié)方差
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A.算術(shù)平均數(shù)
B.中位數(shù)
C.眾數(shù)
D.調(diào)和平均數(shù)
A.2個(gè)
B.3個(gè)
C.4個(gè)
D.5個(gè)
A.任意調(diào)查
B.立意調(diào)查
C.配額抽樣
D.整群抽樣
A.名義尺度
B.順序尺度
C.差距尺度
D.比例尺度
A.每個(gè)省的人口
B.每個(gè)縣的人口
C.每個(gè)家庭的人口
D.每個(gè)人
最新試題
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?()
The number of class intervals in a frequency distribution is usually between ().
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)?
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%。假定全廠各級工資水平均無變化,則2019年職工總平均工資將()
One rule that must always be followed in constructing frequency distributions is that ().
對某班級學(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()
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()
要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()
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?()
什么是季節(jié)變動(dòng)?研究它的意義何在?如何測定季節(jié)變動(dòng)?