When 15% of the people in a longitudinal study on dating behavior quit, the investigator needs to worry about _____ as a threat to internal validity.

Name: When 15% of the people in a longitudinal study on dating behavior quit, the investigator needs to worry about _____ as a threat to internal validity.
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Mortality refers to the loss of participants from a study over time, which can threaten the internal validity if the dropouts are not random and affect the study's outcomes.

When 15% of the People in a Longitudinal Study on Dating