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The survey was carried out by a small investigation company “STRATE”, located in Shinagawa ward, Tokyo.
The number of the samples was 400 and the range of age was 15 to 29, and the research was performed solely in the internet.
>400 people
>on the web
Statistically speaking, the error of the estimation won’t exceed 2% when you apply this outcome to the whole population on the earth.