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)？

在組距數(shù)列中，下限就是（）

Which of the following statements is not true？（）

Descriptive statistics deals with methods of（）

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？（）

If data are grouped into intervals and the number of items in each group is listed, this could be called a （）

Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）

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？

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 （）.

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 （）.