In a recent survey, Juliano and colleagues (2012) recorded the prevalence of withdrawal symptoms among adult respondents who expressed interest in reducing or quitting caffeine use. What percent of individuals who used approximately double the normal daily average intake for U.S. adults experienced headaches as a withdrawal symptom?

Question

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90% of individuals who consumed approximately double the normal daily average intake of caffeine for U.S. adults experienced headaches as a withdrawal symptom.

In a Recent Survey, Juliano and Colleagues (2012) Recorded the Prevalence