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from my escort survey, self-reported age and estimated monthly earnings. sample size kinda small, each bin is n=~40
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The vast majority of research is conducted with non-representative convenience samples (like this). Real pop variance is unknown. Reducing your margin of error means little if you begin with a nonrepresentative sample.
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So you could increase your sample from 40 to 4000 and there would be no guarantee that it would be any more representative. In fact given nonrepresentative sampling to begin with you could even expect it to be worse, less representative.
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