A.普查
B.抽样调查
C.重点调查
D.典型调查
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A.年龄
B.学习成绩
C.专业
D.个人爱好
A.是等距分组
B.第一组假定下限是0
C.相邻组限是重叠的
D.分组标志为连续型变量
E.某学生的成绩80分应归在70-80这一组
A.15次方
B.16次方
C.17次方
D.18次方
A.1.2
B.0.8
C.1.25
D.0.83
A.比例相对指标
B.结构相对指标
C.比较相对指标
D.强度相对指标
A.比例相对数
B.计划完成相对数
C.强度相对数
D.动态相对数
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？（）
A.80
B.200
C.20
D.100
最新试题
A politician who is running for the office of premier in a state with 3 million registered voters commissions a survey. In the survey, 53.6% of the 5000 registered voters interviewed say they plan to vote for him. The population of interest is the（）
A cumulative frequency distribution would provide（）.
企业生产一种产品需顺次经过四个车间，这四个车间的废品率分别为1.5%、2.0%、2.0%和1.0%。该企业生产这种产品的平均废品率是多少？
在组距数列中，下限就是（）
如果居民按报告期价格购买商品需多支出40万元，报告期商品销售额为200万元，则价格指数为（）
常用的长期趋势测定的方法有哪些？各有什么特点？
要了解某地区全部大学生的就业情况，那么（）
变量数列中，各组频率之和应（）
Which of the following is not the goal of descriptive statistics?（）
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 （）.