若一组样本数据 x1,x2,⋯ ,x8{x}_{1},{x}_{2},\cdots ,{x}_{8}x1,x2,⋯,x8 的方差为 2, ∑i=18(−1)ixi=−2,yi=xi+(−1)i(i=1,2,⋯ ,8)\mathop{\sum }\limits_{{i = 1}}^{8}{\left( -1\right) }^{i}{x}_{i} = - 2,{y}_{i} = {x}_{i} + {\left( -1\right) }^{i}\left( {i = 1,2,\cdots ,8}\right)i=1∑8(−1)ixi=−2,yi=xi+(−1)i(i=1,2,⋯,8) ,则样本数据 y1,y2,⋯ ,y8{y}_{1},{y}_{2},\cdots ,{y}_{8}y1,y2,⋯,y8 的方差为___.