The number of subjects to be used in an experiment should depend mainly on
A) the size of the effect
B) the anticipated variability of the data
C) the number available
D) both a and b

Question

Quizplus · Accepted Answer

The number of subjects in an experiment should depend on both the size of the effect and the anticipated variability of the data. A larger sample size may be needed to detect a smaller effect size or to reduce the impact of variability. Additionally, the number of subjects available may also be a factor in determining the sample size, but it should not be the only consideration. Therefore, the best choice is D, which takes into account both the effect size and data variability.

The Number of Subjects to Be Used in an Experiment