Simple approximations of some statistical functions
arXiv:2604.17094 · doi:10.31725/0367-7966-2026-240-1-7
Abstract
Possibilities are considered to simplify the computation of several statistical functions used to test statistical hypotheses when processing observations: the inverse normal distribution, the Student's t-distribution, and the criterion for rejecting outliers. For these three cases, simple approximation expressions are proposed for the quantiles of these statistical distributions, which are accurate enough for most practical applications.