43. (i) A function L is equivariant under G2 if and only if it satisfies (64). For the confidence sets (70), equivariance under G and G reduces to (71) and (72) respectively. => (ii) For fixed (y,,,), the statements u, y, A hold for all (u,...) with Eu = 1 if and only if A contains the interval (y) - [ y, + y). (iii) Show that the statement following (74) ceases to hold when = 1.