The varience - stats
Why is Var(aX + bY) sometimes = a^2Var(X) + b^2Var(Y) but sometimes it's = aVar(X) + bVar(Y)
Original post by FusionNetworks
Why is Var(aX + bY) sometimes = a^2Var(X) + b^2Var(Y) but sometimes it's = aVar(X) + bVar(Y)
I don't think it's ever the second one.
With if the variables are independent.
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