A study was done in Pueblo, CO, to compare the pattern of heart attack rates across the year before and the year after a public smoking ban had been enacted. The researchers who conducted this study used

A study was done in Pueblo, CO, to compare the pattern of heart attack rates across the year before and the year after a public smoking ban had been enacted. The researchers who conducted this study used a(n) ______ design.

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A study was done in Pueblo, CO, to compare the pattern of heart attack rates across the year before and the year after a public smoking ban had been enacted. The researchers who…

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