Each of the Following Is True of Volunteer Bias

Multiple Choice

. Each of the following is true of volunteer bias EXCEPT ______.

A) volunteers for research may represent specific subgroups of the population who differ systematically from the overall population
B) volunteers may be more interested in research than nonvolunteers
C) volunteers may have more spare time than nonvolunteers
D) volunteers are usually less intelligent but more trusting than nonvolunteers