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Variance of a Sum
For two random variables:
$$\operatorname{Var}(X+Y)=\operatorname{Var}(X)+\operatorname{Var}(Y)+2\operatorname{Cov}(X,Y)$$
Usage
- Used when the covariance between variables is known.
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Variance of a Sum
For two random variables:
$$\operatorname{Var}(X+Y)=\operatorname{Var}(X)+\operatorname{Var}(Y)+2\operatorname{Cov}(X,Y)$$
Usage
- Used when the covariance between variables is known.
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