Question

Katherine is a researcher who is interested in examining the effect of caffeine on driving performance. in order to rule out a change in behavior brought about because of participants' expectations about the effect of caffeine, she should use a(n) _____.

Answer 1

A placebo would be the best route to a complete non bias research method. A placebo would allow participants to be a part of the active research without having preconceived notions. This would allow the examination of results of caffeine on driving performance to be performed without any tell-tell, hints or hypochondriac participants.