_____ threatens the validity of a research study because the people who drop out of the research may differ
from those who remain.
A. Attrition
B. Reactivity
C. Repeated testing
D. Selection intervention interaction
ANS: A
PG: 65–66
Feedback: During the course of a research study, some participants may discontinue. Attrition threatens the validity
of the study because the people who drop out may differ from those who remain.
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