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[–] 3 points 2 years ago* (1 child)

To add to your point with a very clear example: If I did a study to check the average age of people in a country where I mainly checked the age of people living in retirement homes, the margin of error would be huge even if I got the age from hundreds of thousands of people.

In more general terms: there can be systemic errors due to methodology that no increasing of the number of samples will remove.

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