弗莱兄弟暖气空调公司,雇佣了Larry Clark 和George Murnen 两位员工从事客服工作,公司经理Tom Fry对他们每日接到的电话进行了统计。对α=0.05,检验平均接到的电话数是否有差异。
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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
最新试题
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 ().
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()
一个地区一定时期的商品零售额属于()
A summary measure that is computed from a sample to describe a characteristic of the population is called()
One rule that must always be followed in constructing frequency distributions is that ().
对全国各铁路交通枢纽的货运量、货物种类等进行调查,以了解全国铁路货运概况。这种调查属于()
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?()
最能反映离散程度的指标是()
The number of class intervals in a frequency distribution is usually between ().