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（）

A cumulative frequency distribution would provide（）.

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 （）.

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

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

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

Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）

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 （）.