Paper 1 · Research Aptitude
UGC NET June 2024 Re-Exam (04.09.2024) Shift-II
In many studies where the time period is long, participants may drop out of the study. This is which of the following threats to internal validity?
ATesting
BInstrumentation
CMortality ✓ Correct
DMaturation
Correct answer: (C) Mortality — It is the mortality (attrition) threat, so that is the answer.
Explanation
★It is the mortality (attrition) threat, so that is the answer.
★Mortality is participant dropout during a study.
★It leaves an incomplete data set.
★This can bias the causal conclusion.
★So it threatens internal validity.
★Hence mortality is correct.
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