You allow fifteen students, chosen at random, an extra day to study for the microeconomics exam, and then measure the score differences between those who got the extra day to study and those that did not. Which of the following could be impediments to implementing this experiment in practice? A. It could be considered unethical to allow some students more time to study.
B. It could be costly to administer the same exam to two different groups of students in the same class on different days.
C. It could be against school policy to administer the same exam to two different groups of students in the same class on different days.
D. A and C only.
E. All of the above could be impediments to implementing this experiment in practice.