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> ADP say that they handle payroll for one in six of all companies in America

that's less than 20%. If you had 10 people to interview and interviewed 2 of them i wouldn't say you interviewed a representative sample of the 10.






No, but if I had 1000 people to interview and interviewed 200 of them at random then absolutely yes.

I know right. Statistics.


The key is "at random". Businesses are not randomly assigned to use ADP

That's a separate problem. I have no idea what the sampling bias is, but the issue isn't that they "only" sample 20% of the population.



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