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A researcher is interested in the relationship between caffeine consumption and activity level for elementary school children. A sample of 20 children is obtained and the children are separated into two roughly equivalent groups. The children in one group are given a drink containing 300 mg. of caffeine and the other group gets a group with no caffeine. The researcher then records the level of activity for each child during a 30 minute session on the playground. Is this an experimental or a correlation study? Explain your answer.

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