7. create 95% confidence intervals for all of the parameters in your final multiple linear regression model and interpret their meaning in the context of the data. [note: the intercept may or may not be meaningful for these data. decide this based on whether it makes sense to describe the biomass of a seedling for which all of the explanatory variables are equal to zero.] copy/paste your r command and your explanations into the green box below. (2 points)