Its actually just a bit more complicated then that. When an attack says [Ability] vs [Defense] you are making an ability attack. When you make an ability attack you add the following modifiers:DangerAbe said:No. You add 1/2 Level plus Strength modifier and attempt to get higher than the target's AC.
1/2 Level is added to all attack rolls.
If it says Strength +2 vs. AC then you add: 1/2 Level + Strength mod + 2.