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umud umud
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Posts: 753
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7 years ago
In experimental research, what does external validity refer to? Briefly describe two instances where external validity is a threat to the overall findings and conclusions of an experiment.
Textbook 
Basics of Social Research, Canadian Edition

Basics of Social Research, Canadian Edition


Edition: 4th
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wrote...
7 years ago
•   External validity is the ability to generalize experimental findings to events and settings outside the experiment itself.
•   Reactivity: Subjects might behave differently if they know they are in an experiment and being tested; that is, participants might react differently in an experiment than they would in real life because they know they are in a study (e.g., the “Hawthorne effect”).
•   Subjects in field experiments are usually unaware that they are involved in an experiment and thus react in a natural way; as a result, field experiments tend to have greater external validity and are more generalizable but less controlled.
•   The natural experiment—a special type of quasi-experimental design where researchers take advantage of a “natural” change in a society and measure an outcome before and after such a change takes place—avoids concerns associated with reactivity and so can have strong external validity.
umud Author
wrote...
6 years ago
Very helpful, thank you
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