One advantage of a stem and leaf plot over a frequency distribution is that （）.

對某班級學(xué)生的生活狀況進(jìn)行統(tǒng)計調(diào)查，下列標(biāo)志中屬于不變標(biāo)志的是（）

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

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（）

在組距數(shù)列中，下限就是（）

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？

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？（）

對全國各鐵路交通樞紐的貨運量、貨物種類等進(jìn)行調(diào)查，以了解全國鐵路貨運概況。這種調(diào)查屬于（）