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一家电器销售公司的管理人员认为,每月的销售额是广告费用的函数,并想通过广告费用对月销售额作出估计。用电视广告费用作自变量,销售额作因变量进行回归分析。下表给出了相关的分析结果:
下列说法正确的是()
A.广告费用每增加$1,000, 销售额增加$1.420 211
B.广告费用每增加$1,000, 销售额增加$1420. 211
C.广告费用每增加$1420.211, 销售额增加$1000
D.广告费用每增加$1, 销售额增加$363.689 1
某汽车生产商想要了解广告费用 (X) 对销售量 (Y) 的影响,收集了过去12年的有关数据。通过计算得到下面的ANOVA表,其中显著水平α=0.05。
方差分析表中虚线所代表的数据分别为()
A.4015.807和399.1
B.4015.807和0.0025
C.0.9755和399.1
D.0.0244和0.0025
A.1065
B.1066
C.1067
D.1068
A.Z<-1.96
B.Z>1.96
C.Z>1.65
D.Z<-1.65
A.7~13
B.8~12
C.9~11
D.9.5~10.5
A.右侧检验
B.左侧检验
C.双侧检验
D.上侧检验
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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?()
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 ().
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()
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以2000年a0为最初水平,2016年an为最末水平,计算钢产量的年平均发展速度时,须开()
Descriptive statistics deals with methods of()
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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()
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