This page lets you understand that t increases as the difference between means increases and that t decreases as the standard error of the mean increases.

How many participants do you think we have? Type the number in the box below.

The difference between our experimental mean (21) and our control group mean (6) was 15.
The standard error of the difference between means was 2

What was our t value? Type the number--rounded to 2 decimal places-- in the box below.