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Suppose that X1, X2, ..., Xn are iid with common pdf: f(x|w) = 2x/w e^[(-x^2)/w] if x>0. Find a statistic which is sufficient for w.

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 To me this looks like a homework question, which puts it out of scope for MO. Voting to close. There are other Q&A websites listed in the FAQ mathoverflow.net/faq which may be useful for you. – David Roberts Mar 5 2012 at 1:26
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 For the next time, it would be useful if you take a brief look at [how to ask](mathoverflow.net/howtoask). – Juan Bermejo Vega Mar 5 2012 at 14:42

closed as off topic by Will Jagy, David Roberts, Robert Israel, Igor Rivin, GH Mar 5 2012 at 1:57

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