Question: 48. Let X be distributed according to P9 ' (J E n, and let T be sufficient for (J. If q>(X) is any test of

48. Let X be distributed according to P9 ' (J E n, and let T be sufficient for (J. If q>(X) is any test of a hypothesis concerning (J, then "'(T) given by "'(I) = E(q>(X)It] is a test depending on T only, an its power function is identical with that of q>(X).

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