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品合格率指標(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 cumulative frequency of the third class？（）
為什么在計(jì)算平均指標(biāo)的基礎(chǔ)上還有必要進(jìn)一步計(jì)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？（）
Which of the following is not the goal of descriptive statistics?（）
最能反映離散程度的指標(biāo)是（）
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
The number of class intervals in a frequency distribution is usually between （）.
Which of the following statements is not true？（）
什么是季節(jié)變動？研究它的意義何在？如何測定季節(jié)變動？