[Solved] You should replace a machine when the EAC of continuing to operate it exceeds the EAC of the new machine. Experimenter Bias: A phenomenon in which the beliefs or expectations of the researcher unconsciously influence the outcome of the study. Informed Consent: A process ensuring that a person fully understands and agrees to the terms and conditions of a procedure or activity, especially in the context of healthcare and research. Sexual Behavior: Actions that individuals engage in to express their sexuality, including physical intimacy and erotic activities. Survey Research Method: A systematic collection of data from individuals using questionnaires or interviews to study and analyze opinions or behaviors.