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

A cumulative frequency distribution would provide（）.

最能反映離散程度的指標(biāo)是（）

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

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 （）.

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（）

A cumulative frequency polygon is also called （）.

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 （）.

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

If data are grouped into intervals and the number of items in each group is listed, this could be called a （）