[Solved] A(n)_____________ experiment guards against experimenters' tendency to prejudge results by eliminating the possibility of either the researcher or the subjects knowing which group is the control and which group is the experimental. Laboratory Workers: Professionals who perform or assist in conducting experiments and analyses in a lab setting, often related to chemistry, biology, or medicine. Analytic Laboratory: A facility equipped for performing scientific experiments and analyses, often involving chemical or biological substances. Optical Microscope: A laboratory instrument used to magnify objects that are too small to be seen with the naked eye by using lenses and light. Condenser: A device used to condense a substance from its gaseous to liquid state by cooling.