Bias in an experiment can occur when
A) a subject does not know who is in the control or experimental groups.
B) a technician knows which samples are from the control group.
C) a subject finds out the results of the experiment after it is finished.
D) a researcher randomly assigns subjects to the control or experimental group.

Question

Quizplus · Accepted Answer

Bias can occur when the technician knows which samples are from the control group, as this knowledge can consciously or subconsciously influence the way they handle or analyze those samples. This can lead to inaccurate results and a lack of valid conclusions. The other answer choices do not necessarily involve bias in the experiment.

Bias in an Experiment Can Occur When