Analyze TwoVariable Statistical Data on the TI83 Plus
The TI83 Plus graphing calculator can perform one and twovariable statistical data analysis. For twovariable data analysis, the data variable for the first data list is denoted by x and the data variable for the second data list is denoted by y.
To analyze twovariable data, follow these steps:

Store your data in the calculator.
Your data does not have to appear in the Stat List editor to analyze it, but it does have to be in the memory of the calculator.

Press
to select the 2Var Stats command from the Stat Calculate menu.

Enter the name of your data list (Xlist).
If your data is stored in one of the default lists L_{1} through L_{6}, press [2nd], key in the number of the list, and then press [ENTER]. For example, press [2nd][1] if your data is stored in L_{1}.
If your data is stored in a usernamed list, first press
to insert the letter L and then enter the name of the list. Inserting the letter L tells the calculator that what follows this letter is a data list. To enter the name of the list, use the [ALPHA] key to insert letters.

Press [,] and enter the name of the Ylist.

If necessary, enter the name of the frequency list.
If the frequency of your data is 1, you can skip this step and go to the next step. If, however, you stored the frequency in another data list, press [,] and then enter the name of that frequency list (just as you entered the Xlist in Step 3).

Press [ENTER] to view the analysis of your data.
Use the
keys to view the other values that don’t appear on the screen.