57 Restoring self-control while intoxicated. Refer to the Experimental and Clinical Psychopharmacology (Feb.

2005) study of restoring self-control while intoxicated, presented in Exercise 34 . The researchers theorized that if caffeine can really restore self-control, then students in Group AC (the group that drank alcohol plus caffeine)

will perform the same as students in Group P (the placebo group) on the word completion task. Similarly, if an incentive can restore self-control, then students in Group AR

(the group that drank alcohol and got a reward for correct responses on the word completion task) will perform the same as students in Group P. Finally, the researchers theorized that students in Group A (the alcohol-only group) will perform worse on the word completion task than students in any of the other three groups. Access the data in the DRINKERS file and conduct Tukey’s multiple comparisons of the means, using an experimentwise error rate of .05. Are the researchers’ theories supported?