In a well-designed experiment, selection bias is controlled by
A) The existence of a control condition
B) The independent variable
C) Random allocation of subjects to conditions
D) Using a within-subjects design

Question

Quizplus · Accepted Answer

Random allocation of subjects to conditions helps to control for selection bias by ensuring that each participant has an equal chance of being assigned to any of the conditions being tested. This reduces the likelihood that any pre-existing differences in the characteristics of the participants will affect the results of the experiment. The existence of a control condition, the use of an independent variable, and a within-subjects design can all help to control for other types of bias in an experiment, but they are not specifically targeted at selection bias.

In a Well-Designed Experiment, Selection Bias Is Controlled by