1.
样本\((x_{1},x_{2},…,x_{n})\)的平均数为\( \overline {x}\),样本\((y_{1},y_{2},…,y_{m})\)的平均数为\( \overline {y}( \overline {x}\neq \overline {y}).\)若样本\((x_{1},x_{2},…,x_{n},y_{1},y_{2},…,y_{m})\)的平均数\( \overline {z}=α \overline {x}+(1-α) \overline {y}\),其中\(0 < α < \dfrac {1}{2}\),则\(n\),\(m\)的大小关系为\((\) \()\)