How is statistical power affected by the formation of control groups?
A)It is reduced by dividing a limited number of participants equally into a training group and a control group
B)It is increased by dividing a limited number of participants equally into a training group and a control group
C)It is reduced by not using a control group and putting the same limited number of participants into the training group
D)It is not affected by the formation of control groups

Question

Quizplus · Accepted Answer

Dividing a limited number of participants equally into a training group and a control group reduces the sample size in each group, thereby reducing the statistical power of the study. With fewer participants, it becomes more challenging to detect significant differences between the groups. Therefore, the formation of control groups reduces the statistical power of a study.

How Is Statistical Power Affected by the Formation of Control