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
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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
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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
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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
A.a graph of a frequency distribution
B.a running total of the frequencies in the classes
C.the proportion of the total frequencies which fall into each class
D.a very cloudy picture of the frequencies
最新试题
Descriptive statistics deals with methods of（）
变量数列中，各组频率之和应（）
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（）
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？（）
最能反映离散程度的指标是（）
要了解某地区全部大学生的就业情况，那么（）
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（）
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
Claudia Taylor, Director of Global Industrial Sales in Melbourne, is concerned by a deteriorating sales trend. Specifically, the number of customers is stable at 1500 but they are purchasing less each year. She orders her staff to search for causes of the downward trend by selecting a focus group of 40 industrial customers. For this study, the set of 40 industrial customers is a （）.
某厂某年职工劳动生产率为20000元，是历史最高水平的1.2倍。这里的1.2倍是（）