什么是季節(jié)變動？研究它的意義何在？如何測定季節(jié)變動？

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

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

對全國各鐵路交通樞紐的貨運(yùn)量、貨物種類等進(jìn)行調(diào)查，以了解全國鐵路貨運(yùn)概況。這種調(diào)查屬于（）

如果居民按報(bào)告期價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，則價格指數(shù)為（）

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

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 （）.

在組距數(shù)列中，下限就是（）

要了解某地區(qū)全部大學(xué)生的就業(yè)情況，那么（）

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 （）.