Question: In a morally and criminally wrong study, 399 black men with syphilis were not given a treatment that could have cured them. The intent was

In a morally and criminally wrong study, 399 black men with syphilis were not given a treatment that could have cured them. The intent was to learn about the effects of syphilis on black men. The subjects were initially treated with small amounts of bismuth, neoarsphenamine, and mercury, but those treatments were replaced with aspirin.

Determine whether the given description corresponds to an observational study or an experiment.

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