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
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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)
A.F0.05,10,20 = 1/F0.95,10,20
B.F0.05,10,20 = 1/F0.05,20,10
C.F0.95,10,20 = 1/F0.95,20,10
D.F0.95,10,20 = 1/F0.05,20,10
A.第一类错误被称为弃真错误
B.第一类错误被称为纳伪错误
C.第二类错误是原假设不正确,但却被接受的错误
D.第一类错误是原假设正确,但却被拒绝的错误
A.2.14
B.5.66
C.7.28
D.15
A.7%
B.8%
C.9%
D.10%
A.样本空间
B.事件
C.实验
D.概率
A.95%
B.89%
C.68%
D.99%
A.
B.
C.
D.
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
最新试题
If the individual class frequency is divided by the total frequency, the result is the ().
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
企业生产一种产品需顺次经过四个车间,这四个车间的废品率分别为1.5%、2.0%、2.0%和1.0%。该企业生产这种产品的平均废品率是多少?
The number of class intervals in a frequency distribution is usually between ().
One rule that must always be followed in constructing frequency distributions is that ().
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 ().
One advantage of a stem and leaf plot over a frequency distribution is that ().
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 ().
Which of the following statements is not true?()
什么是季节变动?研究它的意义何在?如何测定季节变动?