I'm not good in statistics, so please excuse my noob question. We want to ask a question from people (say what is $2+2$). They might make mistake. We assume that they give the correct answer with the same probability $p$. In case their error rates are not correlated, the probability that they both give the wrong answer is $(1-p)^2$ However, their error rates are not independent, they are correlated. In this case, how can we reason about the accuracy of the result ? Do we need to know the distribution of answers?
Correlation in errors
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statistics
correlation