Social Studies, 27.05.2021 21:50 yuhhhhh2801

Jon studies the number of deaths caused by a particular disease in a county for six months before releasing a new medicine and six months after releasing the medicine. During the same period, he measures the number of deaths caused by the disease in three other counties where this medicine was not introduced. This research design is an example of a(n)

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Jon studies the number of deaths caused by a particular disease in a county for six months before re...