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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
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
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
下面的数据文件显示了在美国匹兹堡大学30名MBA考生的信息。第一列给出身高(英寸),第二列给出MBA刚刚就业后的月收入(数据来源于华尔街日报,12月30日)
写出MBA身高与初始月收入的线性回归方程。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 ()
要了解某地区全部大学生的就业情况,那么()
如果居民按报告期价格购买商品需多支出40万元,报告期商品销售额为200万元,则价格指数为()
品合格率指标是()
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 ().
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 ().
The number of class intervals in a frequency distribution is usually between ().
最能反映离散程度的指标是()
Which of the following is not the goal of descriptive statistics?()
Descriptive statistics deals with methods of()