A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of （）.

最能反映離散程度的指標(biāo)是（）

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

Descriptive statistics deals with methods of（）

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 （）.

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

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？

某企業(yè)2018年技術(shù)工占50%，2019年新招收了一批學(xué)徒工，使學(xué)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（）

The number of class intervals in a frequency distribution is usually between （）.

品合格率指標(biāo)是（）