Social Studies, 17.03.2020 01:34, lizzyyyvv

A major increase in cigarette taxes occurs during a one-year follow-up study of the impact of a smoking cessation program. Identify the main threat to internal validity (History, Instrumentation, Maturation, Mortality, Selection Bias, or Testing).

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A major increase in cigarette taxes occurs during a one-year follow-up study of the impact of a smok...