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Experimental research is a systematic and scientific approach used to investigate cause-and-effect relationships by manipulating one or more independent variables and observing the resulting effects on dependent variables under controlled conditions. In the context of Research Methods and Biostatistics, experimental research plays a crucial role in understanding health outcomes, evaluating treatment effectiveness, and establishing scientific evidence. One of the primary characteristics of experimental research is manipulation. The researcher deliberately changes _________ ______ _____ __________ ________ ___ ________ ________ ______ ______.
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