A cumulative frequency polygon is also called （）.

品合格率指標是（）

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

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 （）.

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？

為什么在計算平均指標的基礎(chǔ)上還有必要進一步計算變異指標？

A cumulative frequency distribution would provide（）.

變量數(shù)列中，各組頻率之和應（）

要了解某地區(qū)全部大學生的就業(yè)情況，那么（）

常用的長期趨勢測定的方法有哪些？各有什么特點？