What is validity?
-Validity: the extent to which something measures what it sets out to measure
What is internal validity?
-The extent to which research findings are due to the mechanisms suggested
What is external validity?
-The extent to which results can be generalised to settings beyond those of the study context
1)Population validity: extent to which research findings can be generalised to other groups of people
2)Ecological validity: extent to which results can be generalised to situations outside those of the research settings
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