A.(1.645,1.96)
B.(0.40,0.50)
C.(0.45,0.55)
D.(0.419,0.481)
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A.F0.05,10,20 = 1/F0.95,10,20
B.F0.05,10,20 = 1/F0.05,20,10
C.F0.95,10,20 = 1/F0.95,20,10
D.F0.95,10,20 = 1/F0.05,20,10
A.第一类错误被称为弃真错误
B.第一类错误被称为纳伪错误
C.第二类错误是原假设不正确,但却被接受的错误
D.第一类错误是原假设正确,但却被拒绝的错误
A.2.14
B.5.66
C.7.28
D.15
A.7%
B.8%
C.9%
D.10%
A.样本空间
B.事件
C.实验
D.概率
A.95%
B.89%
C.68%
D.99%
A.
B.
C.
D.
某汽车交易市场共发生了150项交易,将销售记录按付款方式及汽车类型加以区分如下:
如果从销售记录中随机抽取一项,该项是分期付款的概率是()
A.0.95
B.0.5
C.0.8
D.0.25
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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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 ().
A cumulative frequency polygon is also called ().
A summary measure that is computed from a sample to describe a characteristic of the population is called()
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
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 cumulative frequency distribution would provide().
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 ().
什么是季节变动?研究它的意义何在?如何测定季节变动?
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()
最能反映离散程度的指标是()