某汽車生產(chǎn)商欲了解廣告費(fèi)用X對銷售量Y的影響，收集了過去12年的有關(guān)數(shù)據(jù)。通過計(jì)算得到下面的有關(guān)結(jié)果：
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Which of the following is not the goal of descriptive statistics?（）
對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（）
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（）
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？（）
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
常用的長期趨勢測定的方法有哪些？各有什么特點(diǎn)？
A cumulative frequency distribution would provide（）.
One rule that must always be followed in constructing frequency distributions is that （）.
The number of class intervals in a frequency distribution is usually between （）.
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？（）