An experiment includes a treatment condition, a no-treatment control, and a placebo control. Which two conditions should be compared to determine the size of the placebo effect? a. placebo versus...

An experiment includes a treatment condition, a no-treatment control, and a placebo control. Which two conditions should be compared to determine the size of the placebo effect? a. placebo versus treatment b. placebo versus no-treatment c. treatment versus no-treatment d. You only need to look at the scores in the placebo control condition