6 Problem For each of the following determine whether the variance of the U. of A based on a random sample ( * 1. In ) achieves the Cramer - Rao...

For Part (c), I find T(X) =  through verifying REF, but I don't know how to find the U.M.V.U.E of theta & If this U.M.V.U.E achieves the Cramer-Rao lower bound. If you can provide detailed solution, really appreciate it.

2. 6. 6 ProblemFor each of the following determine whether the variance of the U.M. V. U. E.of A based on a random sample ( * 1. .... In ) achieves the Cramer - Rao lowerbound . In each case determine the Cramer - Rao lower bound and find theefficiency of the U.M. V. J. E.( 2 ) N ( 9 , 4 )( 1 ) Bernoulli ( O )( C ) N ( 0 , 0 2 )( d ) N ( 0 , 0 )`