PSYC 217 Lecture Notes - Lecture 6: Random Assignment, Internal Validity, External Validity

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7 Apr 2015
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Our expectations can unconsciously influence our: experimenter bias behavior, to reduce, make experimenter blind to condition, follow script to the letter, follow well-developed coding procedures. Is this a true experiment: psychoanalysts at two different hospitals were asked to judge the well-being of a young man interviewed on videotape. By the flip of a coin, psychoanalysts at a publicly-funded hospital were assigned to the normal group (ng) and psychoanalysts at a privately-funded hospital were assigned to the abnormal group (ag) Doctors in ng were told that the man was a job applicant. Doctors in ag were told that he was a patient. Mean adjustment ratings: 7 out of 8 for ng, 3. 5 out of 8 by ag. The study concluded that psychoanalysts" ratings were affected by the label used to describe the young man: no random assignment in ng or ag (ng is psychoanalysts from publicly funded hospital and ag is psychoanalysts from privately-funded hospital)

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