Health-Care Researchers in Texas Are Conducting a Randomized Field Experiment

Multiple Choice

Health-care researchers in Texas are conducting a randomized field experiment on the effects of providing free health care to people over 65 years old.One of the logistical issues with this study,however,is that people in the control group tended to drop out of the study at higher rates since they were not benefiting from the treatment.What do sociologists call this phenomenon?

A) selection bias
B) reflexive control
C) differential attrition rates
D) social desirability bias