These data are simulated to match the summary and conclusions of a real study
of overweight employees who were randomly assigned to three diet groups:
a low-fat diet, a low-carb diet (similar to the Atkins diet), and a
Mediterranean diet. The study ran for two years, with 272 employees completing
the entire protocol. Is there evidence of differences in average weight loss
among these diets? If so, which diets appear to be better than which others?