Advanced Placement (AP) Problem Solver - Get Instant Explanations

I NEED HELP WITH THIS QUESTION: A psychology graduate student conducted a study at the entrance to a football game at the university. The entrance was specificallyfor students who made the Dean's List for academic achievement during the previous semester. As they arrived, the graduate studentasked half of the students to record their attendance on an 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. The graduate student measured the percentage of students who took additional free food. Her hypothesis was that students would take more food when they were not asked to sign in. The results are shown in the graph below assume all differences are significant.Part AIdentify each of the following in this study:-Confounding variable-Independent variableExplain why operational definitions are important when conducting research.Provide an operational definition of the dependent variablePart BExplain how the data support or do not support the hypothesisExplain why the students used in this study are not a representative sample of the school's overall population.Explain why the study is not a naturalistic observationI have a question as well: wouldnt the independent variable be just the student who are asked to sign in? Because, isnt the independent the one that is being changed and the dependent variable is the one responding to the change?