The U.S. Centers for Disease Control and Prevention said about 72 million Americansnearly one out of every four of the country's 304 million residentsare considered obese. Millions more are designated as overweight." The American trend toward obesity has prompted many physicians to offer weight-loss programs to their patients. [Source: Price, W. T. "Physicians Get into the Weight-Loss Business." Florida Today, July 7, 2008.] A physician conducted an experimental study to compare the effectiveness of four different weight-loss programs. In the study, 64 obese adults were randomly assigned to the four programs so that each program had 16 adults. The programs lasted for 6 months. The weights of the subjects were measured before and after the programs, and each subject's weight loss was computed in pounds. The following table summarizes the results of the study