单项选择题 Which of the following statements is not true？（）

单项选择题 Descriptive statistics deals with methods of（）

单项选择题 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 （）.