Find a uniformly most powerful test
3. (8 points) For some x > 0, suppose X1, X2,..., Xn is a random sample from a Poisson (1) population.
Using a Gamma(a, β) prior distribution for A, find the posterior distribution for λ.
(Note: The Gamma density is given as: f(y) = $$\frac{\beta^\alpha}{\Gamma(\alpha)}y^{\alpha-1}e^{-\beta y}$$)