Discrete Approximation Comparison Guide Poisson for binomial: lambda=np; inspect n, p, np, n(1-p). Binomial for hypergeometric: p=K/N; display sampling fraction n/N. For each query show exact value, approximate value, absolute error, relative error when meaningful, and an explicit APPROXIMATE label. Original educational material created for STATLAB Academy. Textbooks may be used only as curriculum references.