A distinction, albeit not universally accepted, of sampling bias is that it undermines the external validity of a test ( the ability of its results to be generalized to the rest of the population ), while selection bias mainly addresses internal validity for differences or similarities found in the sample at hand.

A distinction, albeit not universally accepted, of sampling bias is that it undermines the external validity of a test ( the ability of its results to be generalized to the rest of the population ), while selection bias mainly addresses internal validity for differences or similarities found in the sample at hand.

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