The covariance calculation presented in the discussion is confirmed to be correct. The formula used is Cov(Y1+Y2, Ʃ n i=2 Yi) = Cov(Y1, Ʃ n i=2) + Cov(Y2, Ʃ n i=2 Yi), which simplifies to 0 + Var(Y2) = σ^2. The discussion emphasizes the importance of defining the variables Y1 and Y2 for clarity, as well as the notation used for summation.
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Your expressions are confusing. Also you should define Y1 and Y2 and their relationship (if any).jasper90 said:I think this is right, just want to double check.
Cov(Y1+Y2, Ʃ n i=2 Yi)= Cov(Y1, Ʃ n i=2) + Cov(Y2, Ʃ n i=2 Yi) = 0 + Var(Y2) = σ^2
is this right?