BLS polls a sample of firms and then extrapolates those figures to reflect the experience of all firms.
And like most stereotypes, it extrapolates from that narrow truth in a way that harms large numbers of innocent people.
1874, a back-formation from extrapolation by analogy of interpolate. Said in early references to be an expression of Sir George Airy (1801-1892), English mathematician and astronomer. Related: Extrapolated; extrapolating.