Which of the following are correct?
I.One purpose of a double-blind study is to control for researcher bias and placebo effect.
II.The main purpose of randomizing individuals to treatment groups is to control for bias.
III.Replication is used to help reduce chance variation in experiments.

Question

Which of the following are correct?
I.One purpose of a double-blind study is to control for researcher bias and placebo effect.
II.The main purpose of randomizing individuals to treatment groups is to control for bias.
III.Replication is used to help reduce chance variation in experiments.

anonymous · Answer

A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III