关于回归直线的描述错误的是()
A.回归直线应在x的实测全距范围内绘制,不能任意延长
B.截距a表示X取值为0时相应Y的均数估计值
C.方程中b表示直线的斜率
D.b=O时直线与Y轴平行,Y与x无直线关系
正确答案是D
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