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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
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.80
B.0.40
C.155
D.75
最新试题
Which of the following is not the goal of descriptive statistics?（）
One advantage of a stem and leaf plot over a frequency distribution is that （）.
One rule that must always be followed in constructing frequency distributions is that （）.
什么是季节变动？研究它的意义何在？如何测定季节变动？
一个地区一定时期的商品零售额属于（）
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
品合格率指标是（）
Descriptive statistics deals with methods of（）
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 （）.