To eliminate any bias that subjects or researchers may have during an experiment, the scientists use
A. observational research.
B. a control group.
C. a double-blind placebo-controlled study.
D. a peer-reviewed journal.
Question 2
During an experiment, the group given a specific treatment is called
A. the control group.
B. the experimental group.
C. the double-blind group.
D. the blind group.