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Try it risk-free Psychologists use experiments to investigate how manipulation of one factor causes a change in another factor.
Sorry, choosing to put the first 150 students who come to class in the experimental group is also not random assignment.
Maybe those students who get up earlier to make it to class on time typically perform higher on tests because they get more sleep.
It allows psychologists, and budding psychologists like yourself, to have confidence that the results of your study are valid.
In psychology experiments, psychologists use random assignment to assign subjects to groups.
Suppose one day while studying for a test, you notice that you seem more focused and productive while you are listening to music.
In fact, you think it's possible that listening to music while studying helps you earn better grades on tests.Choosing every third name off a list of students is also random.Several computer programs can generate a random assignment of participants for you.Random assignment is the only way to eliminate other variables that could influence your results. There are a lot of different methods; the only requirement is that every subject has an equal chance to be in the experimental group.Drawing names out of a hat or creating a lottery are ways to make assignment to the experimental group random.But to know if the music has an effect on test scores, you will also need to compare the results of the experimental group to a control group, a group which doesn't receive the critical part of the experiment.In this case, our control group won't listen to music while studying.The second factor - the one being influenced by changes - is called a dependent variable.This kind of variable changes based on the independent variable.The experimental group is the group who receives the critical part of the experiment, the treatment.This is the group who will listen to music while studying.