The Gunners have struggled to score regularly so far this season.
And Arteta said, "This is what we want [to do]. We've been more efficient in this competition.
"It can be down to some of the players that we utilise in certain positions, it can be because of the opposition, there are a few factors there.
"I must say that if we want to be fighting with the big clubs, obviously the amount of goals that we score has to improve because defensively I think we've had four clean sheets in the last six games, which is pretty good, but offensively our numbers have to improve."