Agree with Tom -- switching value ordering in the column properties will get you what you want. But that's not strictly necessary -- the t-test you want is probably already there. I ran a t-test on the Big Class sample data set, using Fit Y by X. (Y=height, X=sex).
![4526_Selection.png 4526_Selection.png](https://community.jmp.com/t5/image/serverpage/image-id/273iB844B098C1DAF8C4/image-size/medium?v=v2&px=400)
The two tailed p-value is .0208.
The one-tailed p-value for the null hypothesis that females are taller than males is .0104.
The one-tailed p-value for the null hypothesis that males are taller than females is .9896.
Reject the hypothesis that females are taller than males.
Hope this helps,
Jordan