某建筑公司投标了两项工程。该公司对投标的所有可能结果主观分配的概率如表：
您可能感兴趣的试卷
你可能感兴趣的试题
A.变窄
B.变宽
C.不变
D.不能确定
A.要宽
B.要窄
C.相同
D.可能宽也可能窄
A.正态分布
B.只有当n＜30时，为正态分布
C.只有当n≥30时，为正态分布
D.非正态分布
A.足够大时
B.足够小时
C.无论大与小
D.无法判断
A.随机误差
B.抽样框误差
C.回答误差
D.无回答误差
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，（）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
A.大于
B.小于
C.等于
D.不能确定大于或小于
A.纯随机抽样
B.等距抽样
C.分层抽样
D.整群抽样
最新试题
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（）
Which of the following statements is not true？（）
If the individual class frequency is divided by the total frequency, the result is the （）.
变量数列中，各组频率之和应（）
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 （）.
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 （）.
要了解某地区全部大学生的就业情况，那么（）
一个地区一定时期的商品零售额属于（）
One rule that must always be followed in constructing frequency distributions is that （）.