As the others have stated there is generally good bear hunting on public land. But to go a little further, even know the North Central part of PA (PA Wilds, if you are into advertising) is all good habitat, some places are just a little better than others. The more research and planning you do, the greater the odds are for success. And that is a relatively long odds even then. But I do not want to discourage you. I actually have been fortunate to have harvested a very fine Bear, (Warren Co. '95), but I was hunting excellent territory, that had many years of noted bear activity. Do your homework and pick a spot that has produced in the past. Search the PA Game Commision site, I believe they keep some pretty good data. Then do some scouting. Do not be dejected if you are in a small group. If there are other parties driving an area, you still stand a chance at success. I have an associate which killed a bear at a few yards away,attempting to slip out the back of an organized drive.
Sorry this got so long winded, but I believe PA has some of the best bear hunting in the lower 48.(I'm biased I know) Do the leg work and be persistant it can happen.