Rosenthal's (1966) finding that male researchers tended to be more pleasant and relaxed when the participant was female rather than male is an example of which type of effect?

Question

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Rosenthal's finding that male researchers behaved differently based on the gender of the participant is an example of the experimenter effect, which refers to the potential for researchers to unintentionally influence study outcomes through their actions or behavior. In this case, the researcher's behavior towards the participant varied based on gender, indicating a potential bias in the study.

Rosenthal's (1966) Finding That Male Researchers Tended to Be More