In this case, our control group won't listen to music while studying. How will you decide who is in the experimental group and who is in the control group? What about allowing students to choose which group they're in? No, that won't work. Maybe the students who choose to listen to music are already better students who excel at focused studying. We can't assume the results will be valid.
Okay, so how about picking the experimental group based on a first-come basis? Sorry, choosing to put the first 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. Random assignment is the only way to eliminate other variables that could influence your results.
Get access risk-free for 30 days, just create an account. So how do you ensure random assignment? 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. Choosing every third name off a list of students is also random. Several computer programs can generate a random assignment of participants for you.
The important piece is that subjects are equally likely to be in the experimental group. Random assignment is the best way to assure that the only difference between the control group and the experimental group is whether or not they receive the treatment. Any other differences between groups, such as amount of sleep, G. Random assignment is the only way to assume the difference in test scores is caused by listening to music while studying. 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. Using random methods, subjects are assigned to either an experimental group , which will receive an experimental treatment and be observed, or the control group , which is observed under normal, non-experimental conditions.
Random selection ensures that there will be no confounding variables , or factors that could influence the result of the experiment; confounding variables can render an experiment's findings completely invalid. There are many ways to assign subjects completely randomly: You can use a computer program, take names from a list at regular intervals, or even pick names from a hat. The important thing is that a random assignment method must allow every subject an equal chance of being in either the experimental group or the control group.
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