Joseph's setup is what I would do. I always use AF-S single point focus and set to the center point. One issue with the D3200 (and D5100) is there is no way to lock the focus point to any one point. So if the point wanders off center just press the OK button to re-center it. Using that see if your in focus percentage increases. Your AFS 18-200mm lens would be fine for this test. Just make sure that while attaining focus you allow enough time for the VR to settle down before pressing the shutter button all the way.