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【单选题】
设两个变量X和Y之间有线性相关关系，它们的相关系数是R，Y关于X的回归直线的斜率是B，纵截距是A，那么必有（ ）
A.
B与R的符号相同
B.
A与R的符号相同
C.
B与R的符号相反
D.
A与R的符号相反
E.
以上选项都不符合
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