Related samples designs require fewer subjects than independent sample designs to achieve the same degree of statistical power.

Question

Quizplus · Accepted Answer

Related samples designs involve comparing two groups that are matched or paired in some way, such as comparing the same individuals before and after a treatment. This reduces variability and increases statistical power, meaning fewer subjects are needed to detect a significant difference between the groups compared to independent sample designs where the groups are not matched or paired.

Related Samples Designs Require Fewer Subjects Than Independent Sample Designs