When the researcher himself alters or changes the result of the study. For example, a teacher studying differences in math skills between boys and girls might spend more time teaching boys because he/she believes that boys are better at math
A. Operational definitions
B. Overconfidence
C. Observer bias
D. Random sample
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a simulated or otherwise medically ineffectual (fake) treatment for a disease or other medical condition intended to deceive the recipient. Often given to the control group in an experiment.
A. Scatterplot
B. Placebo effect
C. Skewed distribution
D. Placebo
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