A.各组的变量值
B.各组的次数
C.各组的组中值
D.各组的频率
E.各组的密度
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A.均值大于中位数
B.均值小于众数
C.中位数小于众数
D.均值等于众数
E.均值小于中位数
A.数学期望为0
B.标准差为1
C.方差为1
D.偏度系数为0
E.峰度系数为3
A.数学期望为p
B.数学期望为q
C.方差为p＋q
D.方差为pq
E.方差为p/q
A.概率分布表
B.概率分布图
C.概率分布函数式
D.回归函数式
E.方差分析表
A.柱状图
B.直方图
C.折线图
D.散点图
E.立方图
A.推断误差
B.不确定性
C.逻辑错误
D.不可行性
E.外延错误
A.总体指标
B.个体指标
C.样本指标
D.子总体指标
E.类指标
A.存量指标
B.流量指标
C.水平指标
D.实物指标
E.价值指标
A.总标题
B.横行标题
C.纵栏标题
D.数据资料
E.表末附注
A.同质性
B.互斥性
C.完备性
D.分散性
E.整齐性
最新试题
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
变量数列中，各组频率之和应（）
在组距数列中，下限就是（）
对某班级学生的生活状况进行统计调查，下列标志中属于不变标志的是（）
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 （）.
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 cumulative frequency polygon is also called （）.
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 （）.
某企业2018年技术工占50%，2019年新招收了一批学徒工，使学徒工的比重增加了10%。假定全厂各级工资水平均无变化，则2019年职工总平均工资将（）
Descriptive statistics deals with methods of（）