Dr. Stanley would like to find out whether her study guide helps students perform better on exams. She randomly assigns students to one of two groups: Group 1 receives her study guide and Group 2 receives no study guide. Then, after three weeks, the performance of each student is measured on an exam. What is the dependent variable in this study? Group of answer choices the study guide the group that did not receive the study guide students’ performance on the exam There is no dependent variable in this study.