データの分析

共分散：\( S_{xy} = \displaystyle \frac{1}{n} \{ (x_1 - \bar{x})(y_1 - \bar{y}) + (x_2 - \bar{x})(y_2 - \bar{y}) + (x_3 - \b...

平均：\( \bar{x} = \displaystyle \frac{1}{n} (x_1 + x_2 + x_3 + \ldots + x_x) \) 分散：\( {S_x}^2 = \displaystyle \frac{1}{...