Question: The effects of alcohol intake on aggressive driving are studied in a group of students tested on a driving simulator. Thirty students are equally and randomly assigned either to a placebo group or to a group whose members receive an ounce of alcohol 30 minutes before the driving simulation test is given. The dependent variable is the number of crashes during the 5 minute driving simulation. Determine whether or not the alcohol increased aggressive driving. If you reject the null hypothesis, tell what it means in the context of the problem.