A Psychology graduate student conducted a study at the entrance to a footballl gave at the university. The enterance was specifically for studnets who mae\de the Dean's List for academic achievement during the previous semester. Some students arrived to watch the game by themselves, while others arrived in a group. As they arrived, the graduate student asked half of the studnets to record their attendance on the attendance sheet. the remaining half were allowed to enter the game without recording their attendance. The graduate student told every student to take one soda and one hamburger from a concessions table sponsored by the Dean's office. She then returned to the sign-in table out of sight of the concessions. This gave the students the opportunity to take additional food. List the control group, confounding variable, independent variable, and dependent variable.