A.B;>0
B.B;=0
C.B;<0
D.B;=1
E.不能确定正负
2023-08-29
对于一组服从双变量正态分布的资料,经直线相关分析得相关系数r=0.9,对该资料拟合回归直线,则其回归系数b值( )
参考答案:A
参考答案:A
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2023-08-29
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