A.必须相同
B.必须不同
C.可以相同，也可以不同
D.完全没有关系
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A.an ogive
B.a histogram
C.a frequency polygon
D.a stem and leaf plot
A.a parameter
B.a statistic
C.a population
D.Both A and C are correct，since they are the same
A.One form of descriptive statistics uses graphical techniques
B.One form of descriptive statistics uses numerical techniques
C.In the language of statistics，the term population refers to a group of people
D.Statistical inference is used to draw conclusions or inferences about characteristics of populations based on sample data
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
A.1.2
B.0.8
C.1.25
D.0.83
A.histogram
B.ogive
C.stem and leaf chart
D.pie chart
A.提高
B.下降
C.不变
D.条件不够，无法判断
A.3 and 5
B.7 and 9
C.5 and 15
D.1 and 25
A.时点指标
B.时期指标
C.总量指标
D.质量指标
E.数量指标
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