A.純隨機(jī)抽樣
B.等距抽樣
C.分層抽樣
D.整群抽樣
您可能感興趣的試卷
最新試題
A cumulative frequency polygon is also called （）.
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？（）
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過(guò)四個(gè)車(chē)間，這四個(gè)車(chē)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？
如果居民按報(bào)告期價(jià)格購(gòu)買(mǎi)商品需多支出40萬(wàn)元，報(bào)告期商品銷(xiāo)售額為200萬(wàn)元，則價(jià)格指數(shù)為（）
Which of the following is not the goal of descriptive statistics?（）
品合格率指標(biāo)是（）
最能反映離散程度的指標(biāo)是（）
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？（）
某企業(yè)的生產(chǎn)計(jì)劃完成百分比采用如下分組，請(qǐng)指出哪項(xiàng)是正確的（）
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？