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A summary measure that is computed from a sample to describe a characteristic of the population is called（）
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（）
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
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？
對(duì)全國各鐵路交通樞紐的貨運(yùn)量、貨物種類等進(jìn)行調(diào)查，以了解全國鐵路貨運(yùn)概況。這種調(diào)查屬于（）
Descriptive statistics deals with methods of（）
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？（）
If the individual class frequency is divided by the total frequency, the result is the （）.
某班的學(xué)習(xí)按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）