Two researchers are both interested in the relationship between caffeine consumption and activity level for elementary school children. Each obtains

Two researchers are both interested in the relationship between caffeine consumption and activity level for elementary school children. Each obtains a sample of n ! 20 children. a. The first researcher interviews each child to determine the level of caffeine consumption. The child during a 30-minute session on the playground. Is this an experimental or a nonexperimental study? Explain your answer.