Question

Explain what happens to an experiment if a) internal validity is lost and b) external validity is lost. What steps can be taken to help a study be both internally and externally valid?

Answer 1

Internal validity is very important in any experiment.It tells us how the study is made with factors like research design,which variable was measured and which was not.Only by having answers to this the research will be accurate.It refers to the accuracy and how well the quality of study is.There are factors that affect the internal validity,they are subjects in the group should be equal from the beginning,instrument used for measuring should be accurate and not changed during the course of the experiment.

External validity is equally important for a study.The results of the study which is applied to settings or people determines external validity.It is found in studies which have more than one study interventions,experimental setting has to be accurate as to not influence the subject results.