Experimental Group

Experimental group refers to the group of subjects who receive experimental treatment and are expected to achieve the anticipated results. In psychological experimental research, when studying the relationship between the stimulus variable and the response variable, an experimental group and a control group are often used in a comparative design. When the stimulus variable is divided into two levels, one experimental group and one control group are enough to be used. When the stimulus variable is divided into three levels, two experimental groups and one control group are required, and so forth. For instance, in order to explore whether numerical memory span training can improve students’ math performance, researches conducted regular numerical memory span training to students of the experimental group and regular math exercises to students of the control group for the same amount of time. After a period of time, the math scores of the experimental group and the control group were...