Physical Variables Although James Wanted to Run All the Subjects

Multiple Choice

Physical Variables Although James wanted to run all the subjects in his experiment by himself, he realized that he couldn't complete the experiment in time without a second experimenter.To control for experimenter personality, he ran half the subjects in each condition and his roommate ran the other half.This strategy is called

A) balancing.
B) constancy of conditions.
C) elimination.
D) isolation.