6.34 Let 31 and $2 be two different estimators for a parameter 0. Suppose Varml] = 25 and Var[2] = 4. a) If Eml] = 6' and HQ] = 6' + 3, which estimator has the smaller mean square error? b) Suppose E[1] = a9 and E[2] = 9 + b, for some positive number [9. For what values of b (if any) does 52 have a smaller mean square error than (:51