researcher would like to evaluate the claim that a new drug, "Acne Buster" can help individuals eliminate acne.  Participants were randomly assigned to 2 different groups. One group of participants is given the Acne Buster pill daily  and the other group is given a placebo (sugar pill).  The researcher records the number of acne outbreaks each individual experiences during the 30-day trial run. What type of study (correlational, longitudinal, experimental, naturalistic observation) is this?

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