I have to find the uncertainty of a quantity Q doing two mean values. For example for a set of parameters I measure ten times Q, I obtain a mean value Q1 and variance Var(Q1). Then for a different set of parameters I measure ten times Q and obtain Q2 and Var(Q2) etc. At the end I compute the mean value which is the sum of Qi but these 10 from one set of parameter to the other are correlated so I don't know how to compute the variance.
Put differently, I don't know how to compute the variance if I have two averages.
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