您可能感兴趣的试卷
你可能感兴趣的试题
要求：
最新试题
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
对全国各铁路交通枢纽的货运量、货物种类等进行调查，以了解全国铁路货运概况。这种调查属于（）
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 （）.
变量数列中，各组频率之和应（）
最能反映离散程度的指标是（）
某企业的生产计划完成百分比采用如下分组，请指出哪项是正确的（）
Descriptive statistics deals with methods of（）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
常用的长期趋势测定的方法有哪些？各有什么特点？
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). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50 employees is a （）.