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Descriptive Statisticshard
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Let XXX and YYY be two variables with the same mean. If Var(X)=4Var(X) = 4Var(X)=4, Var(Y)=9Var(Y) = 9Var(Y)=9, and Var(X+Y)=25Var(X + Y) = 25Var(X+Y)=25, what is the correlation coefficient ρ\rhoρ between XXX and YYY?