在組距數(shù)列中，下限就是（）

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

為什么在計算平均指標(biāo)的基礎(chǔ)上還有必要進(jìn)一步計算變異指標(biāo)？

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 （）.

The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the approximate range of the number of phone calls arriving each hour？（）

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

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

A summary measure that is computed from a sample to describe a characteristic of the population is called（）

某班的學(xué)習(xí)按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）

品合格率指標(biāo)是（）