Psychology Professor Tori Bovard has the hypothesis that ingesting chocolate prior to an exam will improve exam performance. She gives half of her research participants chocolate and the other half a...

Psychology Professor Tori Bovard has the hypothesis that ingesting chocolate prior to an exam will improve exam performance. She gives half of her research participants chocolate and the other half a "fake" chocolate bar. Fifteen minutes later, Professor Bovard gives her research participants an exam. In this hypothetical experiment, what is thedependent variable?