I would like to ask the following questions, thank you so much for your help.

Q3. Let X = {X1, X2, . . . , Xn ) be an independent random sample from N(u + 02, 02). . When the value of of is known, - Find a sufficient statistic Ti for /; - Find the UMVUE f of /; - Can the variance of u achieve the CRLB?. When the value of of is unknown, - Find a sufficient statistic T2 for (u, 62). - Find the UMVUE 62 of o2. - Find the UMVUE u of u. . Suppose Cov(X, S2) = 0. Compare the efficiency of u and u