Type your data into a calculator. Many graphing calculators are capable of handling data in lists, including the TI-89, HP-48G and Casio CFX 9850G Plus. The procedure for entering lists differs according to calculator model. In general, find the STAT function on your calculator, then locate the Table option and enter your data into a list.
Select the one-variable stats function from the STATS menu. This is a feature available in all graphing calculators, usually activated by a function button. To calculate one-variable stats in the TI-89, for example, press "F5" followed by the down arrow to open the drop-down menu and press "1."
Find the standard error in the One-Variable Statistics results list.
Enter the standard error into your calculator's display screen.
Press "ALOG," "LOG^-1," "10x" or "10y" to take the antilog. If your calculator doesn't have a "10x" or "10y" button, look for an "Inverse" button. Press the "Inverse" button and then press the "log" button.