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Homework Statement
Show that the product of the sample observations is a sufficient statistic for theta if the random sample is taken from a gamma distribution with parameters alpha = theta and beta = 6.
Homework Equations
The Attempt at a Solution
So I need to make sure that [tex]Y = \prod X_i[/tex] is a sufficient estimator for theta, which is true if:
[tex]\frac{f(x_1; \theta)...f(x_n; \theta)}{Y = \prod X_i}[/tex] does not depend on theta.
But I keep getting getting 1 for the ratio. Am I correct?
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