In an experiment on painkillers, the control group received a sugar pill after having a painful procedure. Over 80 percent of the participants reported less pain after taking the sugar pill. These participants were demonstrating the ____________ effect.
A. confounding
B. placebo
C. blind observer
D. double-blind
Answer:B
In an experiment on painkillers, the control group received a sugar pill after having a painful procedure. Over 80 percent of the participants reported less pain after taking the sugar pill. These participants were demonstrating the ____________ effect.
A. confounding B. placebo C. blind observer D. double-blind