These questions are posed:
What are the differences between internal and external validity? What would be the main threats (at least 3, please) to each?
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https://brainmass.com/psychology/abnormal-psychology/research-elements-151624
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As you define Internal Validity, you might note how it suggests the degree or extent where results obtained in a research study are a function or product of the variables that were manipulated, measured, /or observed in the study. You might also describe it as how well a study was conducted or how well or confidently the researcher can attribute the outcome or effects merely based on the independent variable, not outside, unrelated, or extraneous factors.
In contrast, you …
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