jumarichard5736 jumarichard5736
  • 16-01-2024
  • Health
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Determine whether the description corresponds to an observational study or an experiment.
Twenty patients with Parkinson's disease are divided into two groups. One group receives an experimental drug to fight palsy, the other a placebo. After one year, memory recall is measured.
a) Observational study
b) Experiment
c) Clinical trial
d) Prospective study

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