Some dietitians are suggesting that a gluten-free diet can help symptoms of ADHD in adolescents. To determine if this had merit, a group of 100 children with ADHD is given gluten-free diets, and a group of 100 children with similar ADHD symptoms resume their normal diet. After 6 months, their symptoms are reevaluate. Q: What are control group, independent variables, depending variable and experimental group?