When one has the option,a related-samples design should be chosen over an independent samples design because
A)related samples result in more variability,and therefore the design is more powerful.
B)related samples result in less variability,and therefore the design is more powerful.
C)related samples designs are simpler to use.
D)related samples designs are intrinsically better than independent samples designs.

Question

Quizplus · Accepted Answer

Related samples result in less variability because the same subjects are being measured twice (or more) under different conditions, reducing the influence of individual differences on the results. This increases the statistical power of the design, making it more likely to detect a significant difference between conditions if one exists. Therefore, related samples designs are preferable over independent samples designs whenever possible.

When One Has the Option,a Related-Samples Design Should Be Chosen