Sofia told us about her own experience with the memory game. However, not everyone is the same, and we cannot be sure the game will work for someone else. Therefore, it is important to test the game with a large group of people. This is called using a large sample size. A sample is the scientific word for the group included in the study—because it is a sample of the population. Although we cannot ask every person in the world to take part in the study, using a large sample size helps us make sure that the results we find are true for more than just one person. If our sample is large enough it will be a good example of the whole population. If the brain-training game helps many people in the group to get better at remembering, we can be more sure the game will work for people in general. Also, using a large sample size means that any result that we find is more likely to be a real, true result; if the study is only done with one person, it could just be a coincidence that the training worked for them.

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Go to source: https://kids.frontiersin.org/article/10.3389/frym.2018.00026