Research Design - Validity
3 important questions on Research Design - Validity
What is the threat of history to validity?
Specific events external to the study that occur at the same time and which may affect the response
What is the threat of maturation to validity?
Processes which are operating within the test units in the study as a function of the passage of time per se
What is the threat of selection bias to validity?
(self-selection) is a serious threat to validity when the subjects are not or cannot be assinged randomly
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