在线性回归模型y=a+bx+ε中,ε~N(0,σ2),则对固定的x随机变量y的均值E(y)=____.
a+bx . 解析: y=a+bx+ε中仅ε为随机项ε~N(0,σ2),E(ε)=0 E(y)=a+bx+E(ε)=a+bx.
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