Which of the following statements is not true？（）

變量數(shù)列中，各組頻率之和應(yīng)（）

一個地區(qū)一定時期的商品零售額屬于（）

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？

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). 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 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（）

Which of the following is not the goal of descriptive statistics?（）

以2000年a0為最初水平，2016年an為最末水平，計算鋼產(chǎn)量的年平均發(fā)展速度時，須開（）