Compare and contrast questionnaires and experiments in terms of their internal and external validity?

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Compare and contrast questionnaires and experiments in terms of their internal and external validity?
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experiments are test of knowledge which can be testing cells, mixture of chemicals and finding love.


questionnaires are test of skills, values and interests which comes from the internal brain.
Reply:If a questionnaire or experiment has internal validity, it means it agrees with itself, that the questions you are asking are all asking the same thing, or trying to "get at" the same information. For example, with the Beck Depression Inventory, we are trying to measure levels of depression, and want to make sure all of the questions are trying to do so, and that they all agree in some way. If there was a question about chocolate cake in there, then it would not have internal validity. If it has external validity, then the questionnaire agrees with other questionnaires or established markers in the field. For example, the Beck Depression Inventory has external validity because it agrees with the symptoms of depression as defined by the DSM (Diagnosic and Statistical Manual). I think this link defines it better: http://chiron.valdosta.edu/whuitt/col/in...

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