要了解某地區(qū)全部大學生的就業(yè)情況，那么（）

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

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

A cumulative frequency polygon is also called （）.

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 （）.

Which of the following statements is not true？（）

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

在組距數(shù)列中，下限就是（）

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

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