设(x 1 ,y 1 ),(x 2 ,y 2 ),…,(x n ,y n ),是变量x:和y的n个样本点,直线l是由这些样本点通过最小二乘法得到的线性回归方程(如图),以下结论中正确的是
A.
x;和y正相关
B.
x和y的相关系数为直线l的斜率
C.
x和y的相关系数在-1到0之间
D.
当n为偶数时,分布在l两侧的样本点的个数一定相同
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