Descriptive statistics deals with methods of（）

如果居民按報告期價格購買商品需多支出40萬元，報告期商品銷售額為200萬元，則價格指數(shù)為（）

品合格率指標(biāo)是（）

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 （）.

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 cumulative frequency of the third class？（）

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

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)？

要了解某地區(qū)全部大學(xué)生的就業(yè)情況，那么（）