So I started playing d&d a while ago, but when I was building my first character ever I didn’t completely know what I was doing so I assigned my rolls to abilities I didn’t totally need to have high stats to and vice versa. Anyway, I’m playing a rogue and I’m at a point where I can pick two things I can double my proficiency with (6th level Expertise feature). I need better Investigation to check for traps etc., but my Intelligence is 11(+0).
My question is can I pick Investigation as one of the things I can double my proficiency with? In other words if my proficiency bonus is +3 (so +6 at this level cause I get to double it)when I roll for Investigation can I add that proficiency bonus to my Investigation roll even though I have +0 intelligence?