likelihood ration statistic for test of independence for contingency table, and conditional indecent

1.Derive the likelihood ratio statistic for the test of independence for a contingency table of dimension I×J, assuming each cell is distributed as an independent Poisson random variable.
2. Suppose that X and Y are conditionally independent (given Z), and that X and Z are conditionally independent (given Y ). Show that X and Y are (marginally) independent.

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