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【多选题】
直线相关分析的特点是( )。A.
两个变量具有对等关系
B.
只能算出一个相关系数
C.
相关系数有正负号
D.
相关的两个变量都是随机的
E.
相关系数的大小反映两变量间相关的密切程度
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