设正态总体X~N(μ1,σ21)与正态总体Y~N(μ2,σ22),其中,μ1,μ1,σ21,σ22均为未知参数,而x1,x2,…,xn1与y1,y2,…,yn2分别为总体X,Y相互独立的样本,记x
A.(S21/S22[1/f0.05(n1-1,n2-1)].S21/S22[1/f0.95(n1-1.n2-1)]) B.(S21/S22[1/f0.05(n-1,n2-1)],S21/S22[1/f0.975(n-1,n2-1]) C.(S21/S22[1/f0.05(n1,n2)],S21/S22[1/f0.95(n1,n2)]) D.S21/S22[1/f0.25(n1,n2)],S21/S22[1/f0.975(n1,n2)正确答案B