The tool uses the critical value tables when n ≤ 25 and a normal approximation for a larger sample size
Header: You may change groups' name to the real names.
Data: When entering data, press Enter after each value.
Difference = Right - Left
You may copy data from Excel, Google sheets or any tool that separate data with Tab and Line Feed.
Copy the data, one block of consecutive columns includes the header, and paste below. . click to see example:
|"points" for "before" bigger than "after"|
|"points" for "after" bigger than "before"|