某汽车生产商欲了解广告费用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有关结果:
销售量与广告费用之间的相关系数是多少?您可能感兴趣的试卷
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假设检验中拒绝域为()
A.Z<-1.96
B.Z>1.96
C.Z>1.65
D.Z<-1.65
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
A.组间平方和除以组内平方和
B.组内均方和除以组间均方
C.组间平方和除以总平方和
D.组间均方和除以组内均方
A.(1.645,1.96)
B.(0.40,0.50)
C.(0.45,0.55)
D.(0.419,0.481)
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某班的学习按考试成绩分为60分以下,60-70,70-80,80-90,90-100,这种分组()
一个地区一定时期的商品零售额属于()
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 cumulative frequency of the third class?()
One advantage of a stem and leaf plot over a frequency distribution is that ().
A summary measure that is computed from a sample to describe a characteristic of the population is called()
A cumulative frequency polygon is also called ().
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()
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()
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 ().
Descriptive statistics deals with methods of()