An advantage in drawing controls from a special group such as family and friends is that they provide more control over confounding variables.
Confounding variables are variables that affect other variables in a way that creates spurious or malformed connections between two variables. They entangle the true relationship between two variables.
Drawing controls from a special group such as family and friends provide an advantage over confounding variables because their history is known and the chances of other unknown variables are greatly reduced.
To learn more about confounding variables here
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