Answer
See the explanation
Work Step by Step
This experiment is ethically objectionable, as the subjects are given reward for high score, which may promote cheating. This could then have effect on the results.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.