Texas Instruments TI-83 Manual Book page 196

11-14 Lists
6. Press Í. A
the left bound.
left corner.
7. Press | or ~ to move the cursor to the stat plot point
that you want for the right bound, and then press Í.
The x-values and y-values of the selected points are
stored in xlistname and ylistname. A new stat plot of
xlistname and ylistname replaces the stat plot from
which you selected data points. The list names are
updated in the stat plot editor.
Note: The two new lists (xlistname and ylistname) will include the
points you select as left bound and right bound. Also, left-bound
x-value  right-bound x-value must be true.
4 indicator on the graph screen shows
is displayed in the bottom-
Right Bound?