## Standard error of the mean of several values of y predicted from a multiple regression

I have a multiple regression equation that predicts a trait of interest ($y$) from two measured traits ($x_1$ and $x_2$). I want to measure $x_1$ and $x_2$ for $k$ individuals of a certain plant species, and use this regression to estimate the mean and standard error of $y$ for this species. I know the standard … Read more