This is a calculator for the The Standard Error of the Difference

Enter the two sample sizes, N1 and N2. Enter the two standard deviations, SD1 and SD2.
Then just press the "Calculate" button.
The Pooled Variance and the Standard Error of the difference will appear.

To clear the calculator, click on your browser's "Back" button to go back a page and then click on the link for the calculator again.