设X1,X2,X3,X 4是来自总体X的样本,θ是未知参数,以下函数不是统计量的为 ()-|||-(1) dfrac (theta )(4)((X)_(1)+(X)_(2)+(X)_(3)+(X)_(4))-|||-(2) dfrac (1)(4)(({X)_(1)}^2+({X)_(2)}^2+({X)_(3)}^2+({X)_(4)}^2)-|||-(3) dfrac (1)(4)(({X)_(1)}^3+({X)_(2)}^3+({X)_(3)}^3+({X)_(4)}^3)-|||-(4) dfrac (1)(4)((X)_(1)+(X)_(2)+(X)_(3)+(X)_(4))-|||-A.(1)-|||-B.(2)-|||-C.(4)