Hypothesis Testing

Thanks everybody in this group for clearing my concepts. I have
another very minor problem.Suppose I've four variablesY, X1, X2 and
X3 from 1992 to 2004. Now, I want to test the hypothesis of each
variable. Suppose I want to test that population X1=0, X2<0 & X3>0.
Now, say I run the regression on Y, independent variable, and
X1,X2,X3 as dependent variables using SPSS.
My problem is can I do above mentioned hypothesis test based on the
beta values I obtained as SPSS output.
I hope I presented the problem clearly.
Sagar.
.