In the last two chapters suggestions were made which were designed to help control experimenter expectancy effects in specific experiments. Drawing upon some of the suggestions made earlier, this chapter considers on a possibly more general basis the selection and training of experimenters as an aid to the control of experimenter expectancy effects. If there were certain kinds of data collectors who never influenced their subjects unintentionally, we could make a point of having only these experimenters collect our data. If the amount and type of an experimenter's training were significant predictors of his expectancy effects, we could establish training programs for data collectors such that its graduates' data would be unaffected by their expectancies or hypotheses.
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