We say that the design of a study is biased if which of the following is true?
A) We suspect racial or sexual prejudice.
B) The study assigns subjects at random to a placebo.
C) The study systematically favors certain outcomes.
D) The study fails to use blocking.
E) The study is double-blind.

Question

Quizplus · Accepted Answer

If a study systematically favors certain outcomes, it is considered biased. A study may be unbiased if it uses randomization or blocking, or if it is double-blind, but the absence of these features alone does not necessarily make a study biased. The suspicion of racial or sexual prejudice would also be a form of bias, but this is not based on the design of the study itself.

We Say That the Design of a Study Is Biased