A researcher is interested in investigating the relationship between sugar consumption and weight gain for high school students. Fifteen volunteers were randomly assigned to one of two groups. The first group contained six volunteers who were put on a low-sugar diet. The second group consisted of the remaining nine volunteers, who were put on a diet in which sugar constituted approximately 15% of their calories consumed. After eight weeks, the change in weight was recorded for each of the volunteers.
Which of the following principles of experimentation are used in this study?

Question

Quizplus · Accepted Answer

The study mentions that the volunteers were randomly assigned to one of two groups, which indicates that randomization was used to eliminate bias in group assignment. Confounding, which refers to extraneous variables that can affect the outcome, is not mentioned in the study. Blocking, which is used to reduce variability within groups, is also not mentioned. Therefore, the best answer is A) Randomization.

A Researcher Is Interested in Investigating the Relationship Between Sugar