A cumulative frequency polygon is also called （）.

時間序列構(gòu)成因素有哪些？分解的基本原理和思路是什么？

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 not the goal of descriptive statistics?（）

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). The average number of absences per employee, calculated from the personnel data of all employees, is a （）.

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 （）.

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，須開（）

The number of class intervals in a frequency distribution is usually between （）.

A summary measure that is computed from a sample to describe a characteristic of the population is called（）

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（）