A summary measure that is computed from a sample to describe a characteristic of the population is 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). The average number of absences per employee, calculated from the personnel data of all employees, is a （）.

變量數(shù)列中，各組頻率之和應(yīng)（）

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

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

Descriptive statistics deals with methods of（）

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？

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

某企業(yè)的生產(chǎn)計劃完成百分比采用如下分組，請指出哪項是正確的（）

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 （）.