Which situation best reflects "attrition" in quantitative research?
A) Control and intervention groups are very different in age ranges.
B) Subjects receive promotional materials about the benefits of the intervention.
C) Adolescent subjects improve in body hygiene practices over 4 years.
D) Control group subjects drop out of the study when their disease process does not improve.
D
Feedback:
Mortality is the threat that arises from attrition in groups being compared. The most severely ill patients might drop out of the experimental condition because it is too demanding.
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