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Experimental and non-experimental studies are two broad categories of research designs used in biostatistics and other scientific fields to investigate relationships between variables and to establish causality or associations. Experimental studies are research designs in which the investigator actively manipulates one or more independent variables to observe the effect on a dependent variable, while controlling other extraneous factors. The hallmark of experimental studies is the deliberate intervention by the researcher, often through random assignment of subjects to different groups or treatments. This manipulation allows for stronger evidence regarding causal relationships between variables. Examples of experimental studies include clinical trials, randomized controlled trials (RCTs), and laboratory experiments. In experimental studies, participants are randomly allocated to experimental __________ __________ _____ _______ ______ _____ _________.
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