How Is Statistical Power Affected by the Formation of Control

Multiple Choice

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