Dr. Anton is clinical psychologist who wants to test a new treatment for severe depression. He posts an announcement for the study online and includes people who score high on a depression inventory, are willing to attend several treatment sessions, and are willing to be randomly assigned to a treatment or control group. Which form of selection bias might be operating?
A) volunteer bias
B) mortality
C) cohort effects
D) instrumentation

Question

Quizplus · Accepted Answer

The form of selection bias that might be operating is volunteer bias. This occurs when the sample of participants is not representative of the population because only those who volunteer for the study are included. In this case, only those who score high on the depression inventory and are willing to attend several treatment sessions are included. Other individuals who may have different characteristics may not volunteer, leading to a biased sample.

Dr Anton Is Clinical Psychologist Who Wants to Test a New