A.加大显著性水平
B.减小显著性水平
C.加大样本容量
D.减小样本容量
E.使用精确分布
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A.原假设是精确假设
B.备择假设是精确假设
C.原假设是非精确假设
D.备择假设是非精确假设
E.样本给定
A.总体中各个个体之间的差异程度
B.样本容量的大小
C.总体中个体数的多少
D.样本的抽取方式
E.抽样调查中登记误差的大小
A.一致性
B.无偏性
C.有效性
D.充分性
E.稳健性
A.各组的变量值
B.各组的次数
C.各组的组中值
D.各组的频率
E.各组的密度
A.均值大于中位数
B.均值小于众数
C.中位数小于众数
D.均值等于众数
E.均值小于中位数
A.数学期望为0
B.标准差为1
C.方差为1
D.偏度系数为0
E.峰度系数为3
A.数学期望为p
B.数学期望为q
C.方差为p+q
D.方差为pq
E.方差为p/q
A.概率分布表
B.概率分布图
C.概率分布函数式
D.回归函数式
E.方差分析表
A.柱状图
B.直方图
C.折线图
D.散点图
E.立方图
A.推断误差
B.不确定性
C.逻辑错误
D.不可行性
E.外延错误
最新试题
要了解某地区全部大学生的就业情况,那么()
One rule that must always be followed in constructing frequency distributions is that ().
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 ().
Which of the following is not the goal of descriptive statistics?()
一个地区一定时期的商品零售额属于()
If the individual class frequency is divided by the total frequency, the result is the ().
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
什么是季节变动?研究它的意义何在?如何测定季节变动?
A cumulative frequency polygon is also called ().
某企业2018年技术工占50%,2019年新招收了一批学徒工,使学徒工的比重增加了10%。假定全厂各级工资水平均无变化,则2019年职工总平均工资将()