Application Exercise: Experimenter bias refers to the phenomenon that data tends to comes out in the desired direction even for the most conscientious experimenters. A social psychologist wants to confirm this phenomenon. The psychologist tells a sample of students that they will be the experimenters in a study, and are then told that all subjects in the study will be given caffeine half an hour before solving arithmetic problems; in reality none of the subjects were given caffeine. However, half of the experimenters are told that caffeine will lead to better performance and the other half are told nothing. The experimenters are then asked to score the arithmetic problems from the subjects. Below are the scores they gave. What can be concluded with a = 0.10? told told nothing caffeine 12 18 14 15 13 21 8 12 14 10 17 14 20 21 10 24