t-Test Probabilities (Algorithm 321); Student's t-Distribution (Algorithm 344) CACM February, 1970 Hill, G. W. Loughhead, M. t-test, Student's t-statistic, distribution function, approximation 5.12 5.5 CA700217 JB February 14, 1978 8:45 AM 2098 5 2098 2098 5 2098 2098 5 2098