1.13.D—Justify the appropriateness of the conclusions based on a well-designed experiment

Justify the appropriateness of the conclusions based on a well-designed experiment.

• Using random assignment of treatments to experimental units allows for cause-and-effect conclusions between the explanatory and the response variables because the potential for confounding variables is reduced.
• Depending on the experimental unit, it may be unethical or difficult to randomly select experimental units to participate in an experiment. In that case, the study’s experimental units are obtained from volunteers and will represent the population of experimental units similar to those who participated in the study.