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A mistake based on believing that what is true for a group must also be true for each individual in the group.
The measure of how well something does what it is supposed to do for a certain group of people under normal conditions.
The measure of how well something does what it is supposed to do under ideal conditions, for example, in a lab instead of in the patient's everyday lives.
The detailed rules for what kind of people a researcher will let into a certain study. For example, being over 60 and having an anxiety disorder diagnosis could be eligibility criteria for a study about how a new medication works for elderly, anxious people.
Research conducted "in the field," where data is gathered first hand. Case studies and surveys are examples of empirical research.
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