Dr. Ramos was interested in the effects of caffeine and music on memory. She randomly assigned participants to be in 1 of 4 groups. • Group 1: Drink 16 ounces of coffee and listen to Lizzo for 15 minutes • Group 2: Drink 0 ounces of coffee and listen to Lizzo for 15 minutes • Group 3: Drink 16 ounces of coffee and listen to no music for 15 minutes • Group 4: Drink 0 ounces of coffee and listen to no music for 15 minutes What is the participant assignment in this research study? Latin square Matched pairs Between groups Within groups

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