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

時(shí)間序列構(gòu)成因素有哪些？分解的基本原理和思路是什么？

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

品合格率指標(biāo)是（）

If the individual class frequency is divided by the total frequency, the result is the （）.

A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of （）.

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

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？（）

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 （）.

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