Typo in book - Probability and Regression Review, page 71, equation 2.44

[Roobite]

Now, under the first, fourth, and fifth, assumptions, we can write:
...
V(y|x) = σ^2

Should be V(u|x) = σ^2?

[kylebutts]

I think both are equivalent actually! $E(y \vert x) = x\beta$, so $Var(y \vert x) = Var(u \vert x)$