Algostream_advanced_models.DistributionProbability distributions used by Hypothesis_test.
All implementations are coarse — sufficient for the project's ≤ 2-significant-figure p-value contract. PDFs are exact closed-form; CDFs and quantiles use the approximations in Special.
module Normal : sig ... endmodule Student_t : sig ... endmodule Chi_squared : sig ... endmodule F : sig ... end