When might bias in an experiment occur?
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 may occur when the technician who is conducting the experiment has knowledge of which samples belong to the control group and which samples belong to the experimental group. This can lead to the technician unintentionally treating samples from each group differently, which can compromise the validity of the results.

When Might Bias in an Experiment Occur