单项选择题

五位部门经理的年收入如表:

要描述五位部门经理的年收入的一般水平, 用()来测度这一集中趋势比较合适。 

A.众数
B.中位数
C.平均数
D.极差


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3.单项选择题若随机事件A与B满足条件PAB=PAPB,则()

A.A与B相互独立
B.A与B不独立
C.A与B相互排斥
D.A与B相关

4.单项选择题统计学的两大基本内容是()

A.统计资料的收集和分析
B.理论统计和运用统计
C.统计预测和决策
D.描述统计和推断统计

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One advantage of a stem and leaf plot over a frequency distribution is that ().

题型:单项选择题

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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 ().

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最能反映离散程度的指标是()

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One rule that must always be followed in constructing frequency distributions is that ().

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Which of the following is best to show the percentage of a total budget that is spent on each category of items?()

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Descriptive statistics deals with methods of()

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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?()

题型:单项选择题