Keeping researchers blind to a condition primarily deals with what problem?

A) experimenter bias
B) external validity
C) the third variable problem
D) random error

Experimenter Bias

A form of bias introduced by the experimenter whose expectations about the outcome of the experiment can be subtly communicated to the participants.

Researchers Blind

A method used in studies where researchers are kept unaware of key aspects of the research, such as which participants belong to the control or experimental group, to prevent bias.

External Validity

The extent to which the results of a study can be generalized to other situations and to other people.