(4)分层随机抽样分别比估计 予=N=∑R,X =1 =367200×1020327+251600×1.114086+208000×1.222857 909322(亩) )=01(+832m)3o间 =1 (5)分层随机抽样联合比估计 910780 R= st ≈1.100690 k 827463 ∑Nx h=1 =RX=1.100690826800=910050(亩)(4)分层随机抽样分别比估计 1 ˆ k RS RS h h h y N y R X = =  =   =  +  +  367200 1.020327 251600 1.114086 208000 1.222857 = 909322( ) 亩 2 2 2 2 1 (1 ) ˆ ( ) ( k h h RS yh h xh h h N f s y s R s = n −  +  ˆ 2 ) − R sh yxh = 15360( ) 亩 (5)分层随机抽样联合比估计 1 ˆ st st c k st h h h y y R x N x = = =  910780 1.100690 827463 =  ˆ 1.100690 826800 910050( ) Rc c y R X = =  = 亩