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If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
If the individual class frequency is divided by the total frequency, the result is the （）.
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（）
Which of the following is not the goal of descriptive statistics?（）
A cumulative frequency distribution would provide（）.
時間序列構(gòu)成因素有哪些？分解的基本原理和思路是什么？
The number of class intervals in a frequency distribution is usually between （）.
為什么在計算平均指標(biāo)的基礎(chǔ)上還有必要進一步計算變異指標(biāo)？
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？（）