One Tail T-Test and Direction When Comparing Groups

1

Dear Brainstorm community,

I just wanted to confirm that when conducting a one tail test, that a (-) tail refers to testing for files B > A, and for a (+) tail, this tests for files A > B.

Thank you.
Paul

2

This is correct.
The "negative" tail corresponds to cases where the value of the T-statistic is lower than what is required to accept the null hypothesis H0. A one-tailed tests ("negative tail") tests the alternative hypothesis H1:(A<B)

https://neuroimage.usc.edu/brainstorm/Tutorials/Statistics#Statistical_inference

3

Great, thank you Francois!