Question: Using E(y) = E[E(y|x)] and var(y) = E[var(y|x)] + var[E(y|x)], derive the mean and variance of the beta-binomial distribution.

Using E(y) = E[E(y|x)] and var(y) = E[var(y|x)] + var[E(y|x)], derive the mean and variance of the beta-binomial distribution.

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