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OpenStudy (anonymous):
How do I find the variance of the sum A+B if the covariance of A and B is -1.7?
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OpenStudy (phi):
http://en.wikipedia.org/wiki/Variance#Sum_of_uncorrelated_variables_.28Bienaym.C3.A9_formula.29 it would be var(A)+var(B)+cov(A,B)+cov(B,A) or var(A)+var(B)+2*cov(A,B)
OpenStudy (anonymous):
Thanks!
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