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对两个独立样本ξi,1≤i≤n1,ξ1~N(a1,σ2);ηi,1≤i≤n2,η1~N(a2,σ2),证明了(ξ)-(η)与√n1S21+n2S22独立,进而证明√n1n2(n1+n2-2)/n1+n2·(ξ- η)-(a1-a2)/√n1S21+n2S22服从参数为n1+n2-2的t分布.