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One advantage of a stem and leaf plot over a frequency distribution is that （）.
為什么在計算平均指標(biāo)的基礎(chǔ)上還有必要進(jìn)一步計算變異指標(biāo)？
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
某廠某年職工勞動生產(chǎn)率為20000元，是歷史最高水平的1.2倍。這里的1.2倍是（）
A cumulative frequency distribution would provide（）.
Which of the following is not the goal of descriptive statistics?（）
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 approximate range of the number of phone calls arriving each hour？（）
常用的長期趨勢測定的方法有哪些？各有什么特點(diǎn)？
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）