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【单选题】
同一资料进行直线回归与直线相关分析时,下列说法正确的是A.
ρ=0 时,r=0
B.
|r|>0 时,b>0
C.
r<0 时,则b>0
D.
r<0 时,则b<0
E.
ρ=0时,b=0
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