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變量數(shù)列中，各組頻率之和應(yīng)（）
Descriptive statistics deals with methods of（）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
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？（）
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？
A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of （）.
One advantage of a stem and leaf plot over a frequency distribution is that （）.
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)告期商品銷售額為200萬(wàn)元，則價(jià)格指數(shù)為（）
一個(gè)地區(qū)一定時(shí)期的商品零售額屬于（）
A cumulative frequency polygon is also called （）.