The syntax for the PROC TTEST statement enables you change the significance level and the type of hypothesis test. For example, to run a one-sided test for the alternative hypothesis μ1 < μ2 at the 0.10 significance level, you can use:

So you have two treatments M and F. How do you know which treatment u1 is and which treatment u2 is? If my treatments were _1 and W which one is u1 and which one is u2?