Pick the research question that calls for calculating a confidence interval for the difference between two population proportions.
What is the difference between the alcohol dependence proportions for those who drink more than one energy drink each week and those who do not drink energy drinks?
What proportion of college students drink more than one energy drink per week?
Are people who consume at least one energy drink a week more likely to be alcohol dependent than those who do not consume energy beverages?
Which group drinks more alcohol on average: people who consume at least one energy drink per week, or people who don't consume energy drinks?