C7) Prove that Var(X-Y)=Var(X)+Var(Y)-2Cov(X,Y)

B5) Prove that Var(cX)=ccVar(X)

C5) If X and Y are independent, then Cov(X,Y)=0

C6) Var(X+Y)=Var(X)+Var(Y)+2Cov(X,Y)

C7) Prove that Var(X-Y)=Var(X)+Var(Y)-2Cov(X,Y)

B4) Prove that E(cX) = cE(X)

D3) What means independent and identically distributed (iid)?

D5) Random Variables: Independent and Identically Distributed (i.i.d.)

[tchill]

Great video, thank you! I learned a lot about variance.