[单选题]如果两个变量之间存在正相关，指出下列方程中哪一个是正确的？（ ） 。
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2023-11-01 15:10:50|
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[单选题]如果两个变量之间存在正相关，指出下列方程中哪一个是正确的？（ ） 。
A.Y=-90-8X
B.Y=-20+40X
C.Y=70-0.05X
D.Y=72.8-6.7X
A.Y=-90-8X
B.Y=-20+40X
C.Y=70-0.05X
D.Y=72.8-6.7X
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