Abstract
Hewlett Packard's Advanced Scientific Calculator HP-28S has built in functions to compute the CDF's of Normal, Chi-square, t and F distributions. The paper shows how to use the HP-28S calculator to obtain the CDF of the Binomial and Poisson random variables using the built in functions UTPF and UTPC of HP-28S. Illustrative examples to obtain the exact confidence intervals of the Binomial and Poisson parameters with HP-28S are given.

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