Trade-off Between Internal Validity And External Validity (Research Paper Sample)

Research Validity
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1 In the context of experimental design in research, what is your understanding of “trade-off between internal validity and external validity"?
My understanding of the “trade-off between internal validity and external validity” is that since in any single experiment design it is an impossibility to attain both types of validities either high or low simultaneously as increasing one type of validity effectively lowers the other, as it happens in the control set up where the control increases internal validity leading to lowering of external validity, the researcher must somehow accept one validity to be lower so that the other may be higher and vice versa.Therefore,the researcher has to strike a balance between the internal and external validity through testing for causality in an artificial setting before a trial in a natural set up.
2 Explain how the selection of participants in a research experiment my affect both the internal and external validity of a research experiment.
Selection of participants may affect external validity in case it does not follow random sampling and random assignment into groups initially leading to selection bias. The bias causes differences after application of treatment to one of the groups. Random sampling ensures results are generalizable thereby ensuring external validity...