Texas Instruments TI-83 PLUS - Manual (Page 338)

TI-83 Plus Statistics 335
Note: You can enter expressions and variables for elements.
4. Press Í , } , or † to update the list. If you entered an expression,
it is evaluated. If you entered only a variable, the stored value is
displayed as a list element.
When you edit a list element in the stat list editor, the list is updated in
memory immediately.