某鞋廠為了制定生產(chǎn)計(jì)劃，調(diào)查了100 個(gè)成年女性穿鞋的尺寸，數(shù)據(jù)如下：
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什么是季節(jié)變動(dòng)？研究它的意義何在？如何測(cè)定季節(jié)變動(dòng)？
A cumulative frequency polygon is also called （）.
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（）
某企業(yè)的生產(chǎn)計(jì)劃完成百分比采用如下分組，請(qǐng)指出哪項(xiàng)是正確的（）
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？（）
The number of class intervals in a frequency distribution is usually between （）.
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50 employees is a （）.
Which of the following is not the goal of descriptive statistics?（）
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？
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）