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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？（）
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 （）.
常用的長期趨勢(shì)測(cè)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？（）
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
以2000年a0為最初水平，2016年an為最末水平，計(jì)算鋼產(chǎn)量的年平均發(fā)展速度時(shí)，須開（）
品合格率指標(biāo)是（）
Descriptive statistics deals with methods of（）
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？
某廠某年職工勞動(dòng)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（）