Suppose that x has a binomial distribution B(n, ) of index n and parameter 0, and that
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Suppose that x has a binomial distribution B(n, θ) of index n and parameter 0, and that it is desired to test H0 : θ = θ0 against the alternative hypothesis H1: θ ≠ θ0:
(a) Find lower bounds on the posterior probability of H0 and on the Bayes factor for H0 versus H1, bounds which are valid for any P1 (θ).
(b) If n = 20, θ0 = ½ and x = 15 is observed, calculate the (two-tailed) P-value and the lower bound on the posterior probability when the prior probability π0 of the null hypothesis is ½.
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