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Can external validity & internal validity affect each other?

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Which is more important: external validity, internal validity, or a balance between the two?

Explain why. How can external validity and internal validity affect one another?

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Research Methods: Which is more important: external validity, internal validity, or a balance between the two?
Explain why. How can external validity and internal validity affect one another?

External validity means that the experiment conforms closely to the natural conditions in the world and so the results would be expected to be generalizable to situations outside of the experimental conditions. In other words, what you find would be expected to be true in the "real world" outside of the experiment design.

Internal validity means that the cause and effect or relationships between variables are clearly controlled so that what you find is not contaminated by other variables. High internal validity comes when you are able to isolate the effects of a particular variable carefully enough that you can conclude that other influences ...

Solution Summary

Your response is 506 words and describes both types of validity, when one dominates, when they are balanced and how they might work together.

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This job assumes that increasing one type decreases the other type

A good experiment has to have Internal and External validity. Checking for validity is like answering a question of whether the experiment has been designed well, whether the variables that are being measured are really affected by variables that are being manipulated in this particular experiment or if they are affected by something else.
Checking for Internal Validity determines whether "the connection between the independent variable and dependent variable clear and unambiguous to make a causal inference? (Leman, 1991). It's making sure that all the confounding factors are eliminated for the experiment.
External Validity has to do with the results. An experiment that has external validity will be able to have results that can be generalized across population at large.

Question to be answered:

Discuss why increasing one type decreases the other type.

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