pre-weight post-weight difference pre-post Average 210.7 205.9 4.8 St. Dev 53.9 53.5 5.5 Thirty overweight individuals signed up for a 6-week diet and exercise plan. The individuals' weights were recorded on the first day (pre-weight), and again on the last day of the program (post-weight, and their total amount of weight loss was computed. A summary of their weights is below