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题目内容
(请给出正确答案)
两变量为正相关,则
A.∑(X-
)(Y-
)为正
B.∑(X-
)(Y-
)为负
C.∑(Y-
)大于∑(X一
)
D.∑(Y-
)小于∑(X-
)
E.X变量大于Y变量
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/09fc5413fc355277.gif)
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/d6d364e667842762.gif)
B.∑(X-
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/923a693d1dfd4409.gif)
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/ab63088fc40fe1e6.gif)
C.∑(Y-
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/bacf57dfb4f49d6e.gif)
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/27d2ec151666e97b.gif)
D.∑(Y-
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/fe9667b49d4b1d32.gif)
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/56e4ebbcdfd83d1f.gif)
E.X变量大于Y变量
参考答案
参考解析
解析:两变量为正相关,则∑(X-
)(Y-
)为正,答案A正确。
分母开根号,只取正值,而分子可以有正、负值,∑(X-
)(Y-
)正值时为正相关,负值时为负相关。
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/c4e3d2fe2f5beb37.gif)
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/697108968204c8b3.gif)
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/ffc4dc8f64f3cca8.gif)
分母开根号,只取正值,而分子可以有正、负值,∑(X-
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/7255732855a3c9a6.gif)
![](https://assets.51tk.com/images/3d47d33ff9fa8582_img/6dbb0a0f1a8e2d4b.gif)
更多 “两变量为正相关,则A.∑(X-)(Y-)为正 B.∑(X-)(Y-)为负 C.∑(Y-)大于∑(X一) D.∑(Y-)小于∑(X-) E.X变量大于Y变量” 相关考题
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如果rS=1,则两变量完全正相关B
如果rS=-1,则两变量完全负相关C
如果rS=1,则两变量等级之差全部为0D
如果rS=-1,则两变量等级之和相等E
如果rS=0,则两变量等级之差相等
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单选题两变量为正相关,则()A
∑(X--x)(Y--Y)为正B
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∑(Y--Y)小于∑(X--x)E
X变量大于Y变量
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