Define the concepts internal and external validity. Discuss why we say that for some experiments an...
Define the concepts internal and external validity. Discuss why we say that for some experiments an attempt at increasing one type tends to jeopardize the other type.
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Homework Answers
Internal validity refers to whether the effects observed in a study are solely due to the manipulation of the independent variable and not some other factor. On the other hand, external validity refers to the extent to which the results of a study can be generalized to other settings and populations. At times, an attempt at increasing one type of validity tends to jeopardize the other type. This is because internal validity is usually improved by strictly controlling extraneous variables so as to isolate the effects of the independent variable on the dependent variable, while external validity is usually improved by setting experiments in a more natural setting. The desire for high internal validity by studying variables in a highly controlled laboratory setting can contradict the desire for high external validity, that requires an investigation of the variables in a real life environment.
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Define the concepts internal and external validity. Discuss why
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