German psychiatrist emil kraepelin contributed to the study of abnormal psychology by
a. observing hundreds of living patients
b. introducing two diagnostic categories
c. laying the groundwork for a classification system
d. all of the above
Answer: d. all of the above
Psychology
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Which of the following refers to an artifact that occurs when participants' expectations about what effect an experimental manipulation is supposed to have influences the dependent measure independently of the actual effect of the manipulation?
a. Experimental impact b. Experimental realism c. Placebo effect d. Attrition
Psychology