“How do they know that one thing caused another?” Many times—particularly in popular media—there will be the claim that one thing causes another. It’s always important to ask: How do they know? This is related to the concept of internal validity, which will be covered in later chapters.
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Internal and external validity are concepts that reflect whether or not the results of a study are trustworthy and meaningful. While internal validity relates to how well a study is conducted (its structure), external validity relates to how applicable the findings are to the real world.
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