一個地區(qū)一定時期的商品零售額屬于（）

常用的長期趨勢測定的方法有哪些？各有什么特點(diǎn)？

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 （）.

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

變量數(shù)列中，各組頻率之和應(yīng)（）

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

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

什么是季節(jié)變動？研究它的意義何在？如何測定季節(jié)變動？

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？（）

如果居民按報告期價格購買商品需多支出40萬元，報告期商品銷售額為200萬元，則價格指數(shù)為（）