Examlex
Briefly summarize the findings on the link between physical health and the maintenance or decline of mental abilities over the adult years.
Posttest-Only
A research design where measures are taken only after the experimental manipulation, without a pretest comparison.
Mortality
The loss of subjects who decide to leave an experiment. Mortality is a threat to internal validity when the mortality rate is related to the nature of the experimental manipulation.
Experimental Design
A research design used to test hypotheses and establish cause-effect relationships by manipulating one or more independent variables and observing the effect on dependent variables.
Mortality
The incidence of death within a population; in research, it can also refer to the dropout rate of participants from a study.
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