[问题1] _ Suppose that 25 measurements of certain data yield sample mean X and sample variance s^2 .Assuming that the sample is from a N(μ,σ^2 ) population,find a level (1-α)confidence region for (μ,σ) [问题2] consider an urn that initially contains one red ball and one black ball. At each time n=1,2…,a ball is drawn, and it and another two balls of the same color are placed back into the urn.Thus,after n draws the urn contains 2n+2 balls. LetYn be the number of balck in the urn after n draws and let Xn=Yn/(2n+2) Prove the identity E(Xn+1|Xn=x)=x ,n=1,2… ============================================================================== 有人可以帮我解答一下吗 感谢~~ --

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