50g

I am trying to plot data points for some Stat work and have hit a
couple of roadblocks. When inputing the data I put in the matrix writ.
and then hit enter to push to stack. Then I copy the data set and
paste it into the 2D/3D plot menu under scatter. I dont enter directly
in there b/c i haven't figured out how to save the table in the
scatterplot menu. One question is that is there a way to save there in
the 2D/3D menu, another has to do with the spreadsheetability of the
matrix writer. I wish to add a third column based on the predicted
value but find that I have to do the math manually and then enter in
data manually, then I wish to take the regression data and plot it ,
but only see how to do that manually. 

Sorry for the length- but can anybody help me find some shortcuts to
do this work