Dr. W taught four General Psychology classes last semester. Each of her classes was the same in: material coverage and methods of teaching & grading. Students’ grades in each of the classes were determined by three exams. After the first exam, for two of her classes, Dr. W posted all of the grades (without students’ names) on a bulletin board; for the remaining two classes she did not post grades.
What informed conclusion might you draw from the above example? Group of answer choicesThe independent variable in the example is exam, whereas the dependent variable is the number of classes Dr. W is teachingDr. W should expect students’ grades to be exactly the same in each of her classes because she used the same teaching and grading methods and covered the same materialStudents grades should be highest on the second exam because the greatest amount of learning occurs in the middle of the semesterStudents in the classes in which grades were posted will have higher grades on the second and third exam because they will be more motivated to outperform their classmatesBecause students drop classes over the length of the semester, the remaining students’ grades on the last exam should be lower than their grades on the first exam