The following is an excerpt from an article "Energy Drink 'Cocktails' Lead to Increased Injury Risk, Study Shows," in sciencedaily.com, Nov. 4, 2007. "College students who drink alcohol mixed with so-called 'energy' drinks are at dramatically higher risk for injury and other alcohol-related consequences, compared to students who drink alcohol without energy drinks ... The researchers found that students who consumed alcohol mixed with energy drinks were twice as likely to be hurt or injured, twice as likely to require medical attention, and twice as likely to ride with an intoxicated driver ..." The study collected data from a web-based survey of 4,271 students at 10 North Carolina colleges and universities.

To use the hypothesis test procedure inInference for Two Proportions, we must have two populations (or two treatments) with a categorical response variable. Identify the population(s) and the response variables in this study. Is this a situation relevant toInference for Two Proportions?

The article from sciencedaily.com continues, "'We knew anecdotally -- from speaking with students, and from researching internet blogs and websites -- that college students mix energy drinks and alcohol in order to drink more, and to drink longer,' said Mary Claire O'Brien, M.D., associate professor of emergency medicine and public health sciences and lead researcher on the study. ... Compared to current drinkers who did not consume alcohol mixed with energy drinks, students who did drank significantly more during a typical drinking session (5.8 drinks versus 4.5 drinks/typical session.)"

Identify the populations and the response variables in this study. Could we use data from this study to conduct a hypothesis test inInference for Two Proportions?