Dichotomizing a Numeric Variable Usually Is Done So That

Multiple Choice

Dichotomizing a numeric variable usually is done so that

A) one group is high on the variable,and one group is low on the variable.
B) one group is extreme on the variable,and one group has scores near the middle range on the variable.
C) overall differences between means on the measured variable are reduced.
D) overall variance on the measured variable is increased.