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-In the table above, country B is producing 4 units of X and 6 units of Y. For country B, the opportunity cost of producing an additional unit of X is
Pretest-Posttest
A research design that measures the effect of an intervention by comparing conditions before and after the intervention is applied.
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.
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