In a double-blind design, __________.

A) neither the investigators nor the study's participants know who is in the control group and who is in the experimental group
B) there is no control or experimental group
C) placebo effects are increased
D) confounds are increased

Double-blind Design

An experimental design in which neither the participants nor the experimenters know who is receiving a particular treatment, used to eliminate bias in research findings.

Confounds Increased

The introduction of variables or factors that obscure or confuse the relationship between the variables being studied, complicating the interpretation of results.