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Vince is extremely impressed with himself. Although he has only achieved a moderate amount of success, he thinks of himself as being uniquely special and deserving of the best of everything. Vince fantasizes frequently about great wealth and fame and does not really pay much attention to other people except to note how they react to him. Vince should be diagnosed with personality disorder.
Random Sample
A method of selecting a sample from a population in which each member has an equal chance of being chosen.
External Validity
The extent to which the results of a study can be generalized to other situations and to other people.
Internal Validity
The extent to which a study establishes a trustworthy cause-and-effect relationship between a treatment and an outcome.
Institutional Review Board (IRB)
A committee that reviews and monitors research involving human participants to ensure ethical standards are maintained.
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