Q: Use hypothesis testing procedures to test the a priori assumption that people who are fearful of walking in their neighborhood at night have lower average trust than people who are not fearful. Use a 2 t-tail, with alpha of 0.001

Question

Q: Use hypothesis testing procedures to test the a priori assumption that people who are fearful of walking in their neighborhood at night have lower average trust than people who are not fearful. Use a 2 t-tail, with alpha of 0.001          
                            Fear
                      Yes                          No
Mean            1.08                          1.46
S.D                1.14                         1.14
n                     245                         415

My work:
t= 1.08-1.46/sqrt 1.14^2/245 + 1.14^2/415 = -4.14
Can t-statistics be negative? Am I doing something wrong?