Experimenter bias
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Experimenter bias is the introduction of any bias into the conclusions of an experiment due to the preconceptions or goals of the experimenter. The bias can be introduced at any stage of the experiment, from the construction of the experiment, the selection of subjects, the analysis of the data, or the conclusions drawn.
A great number of experimental methodologies are attempts to limit the unintentional introduction of experimenter bias. These include randomized controlled trials and double blind.
Most experiments that purport to show evidence for psychic powers, alternative and quack medicine, or other woo fail to use proper methods and controls to limit experimenter bias. When replication attempts are made that do control for experimenter bias the results are shown to be no better than chance.