A research assistant is interviewing elderly adults at community center, but only adults who have access to transportation to the center are likely to participate. This illustrates what type of threat to external validity?
A) Interaction of treatment with selection of subjects
B) Research bias of only elderly adult participation
C) Interaction of treatment and setting generalization
D) Effects of selection limiting representativeness

Question

Quizplus · Accepted Answer

The situation describes a selection bias where only those with transportation can participate, limiting the representativeness of the sample and thus threatening external validity.

A Research Assistant Is Interviewing Elderly Adults at Community Center