The effects of the placebo are compared to the effects of the actual independent variable on the experimental group. This group serves as a check for practice effects and expectancy effects.

Question

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This statement is true. A placebo group is essential in experimental research to control for potential confounding variables such as practice effects and placebo effects. The effects of the experimental group are compared to those of the placebo group to determine whether the treatment or intervention had a significant effect.

The Effects of the Placebo Are Compared to the Effects