i want to know about proving lehmann theorem about uniformly minimum variance estimator?

Question

giving me a site or proving it would be great thanks!

Answer 1

The sites I've found which claim to offer this proof require you to purchase a journal article download or a book. But maybe this free site (University of Illinois) will help you:
http://www.math.uiuc.edu/~r-ash/Stat/StatLec16-20.pdf

This one (Iowa State U) offers a proof which starts with the Rao-Blackwell Theorem:
http://www.public.iastate.edu/~vardeman/stat543/Handouts/Lehmann-Scheffe.pdf