Question

Often times in experimental settings there is an inverse relationship between internal and external validity. Explain why this is true. Next, discuss experimental situations in which it might be more important to have high internal validity and those in which external validity would be more highly valued.

Answer 1

• Interan validity can be best defined as establishing a casual relationship between a given set of variables without the influence of any other extraneous or confounding variable.
• External validity can be defined as the casual relationship that is drawn from a given study and it's application or superimposition on the rest of the population or across different settings.

Eternal validity is said to be drawn from internal validity and is said to be dependent on the former. However, there happens to be an inverse relationship present between the two. That is when one increases the other one decreases.

Let's consider the possibility of an experiment where internal validity is more valued. This would be an experiment that is in a lab as the possibility of having extraneous or confounding variables is considerably less and is under the control of the lead investigator. This would, however, compromise the external validity as the setting would be considered too artifical to have any practical explanation for the 'real' world. But this is would be especially important in clinical trials. Where the external validity could be compromised.

An example of where external validity would be esteemed more than the internal validity would be a setting of behavioral study wherein it is necessary to chart down, say, the behavior of students across subjects. Then the external validity would be esteemed higher as it requires a real life observation as opposed to one thst could be vitiated through control settings.

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