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Identify the study as observational or experimental.One group of subjects was given an herbal supplement for one year, another group was given a placebo. After
Identify the study as observational or experimental.One group of subjects was given an herbal supplement for one year, another group was given a placebo. After one year, the number of illnesses each group had was compared.
Identify the study as observational or experimental.One group of subjects was given an herbal supplement for one year, another group was given a placebo. After one year, the number of illnesses each group had was compared.
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