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?（）

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？

企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過四個(gè)車間，這四個(gè)車間的廢品率分別為1.5%、2.0%、2.0%和1.0%。該企業(yè)生產(chǎn)這種產(chǎn)品的平均廢品率是多少？

變量數(shù)列中，各組頻率之和應(yīng)（）

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 （）.

某班的學(xué)習(xí)按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）

A cumulative frequency polygon is also called （）.

什么是季節(jié)變動(dòng)？研究它的意義何在？如何測定季節(jié)變動(dòng)？

One rule that must always be followed in constructing frequency distributions is that （）.