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

某企業(yè)2018年技術工占50%，2019年新招收了一批學徒工，使學徒工的比重增加了10%。假定全廠各級工資水平均無變化，則2019年職工總平均工資將（）

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 （）.

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

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？

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，則價格指數為（）

If the individual class frequency is divided by the total frequency, the result is the （）.

品合格率指標是（）

常用的長期趨勢測定的方法有哪些？各有什么特點？

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