[WP34S] ChiSquare Distribution

01112014, 01:37 PM
Post: #1




[WP34S] ChiSquare Distribution
Hello,
I was comparing output between HP48sx MATHLIB [Ref. 1] and WP34S (v 3.2 3375) for some of the probability distributions. For this purpose, I was replicating the examples from the HP21S user's manual (pg. 4252) I noticed that the Inverse of the ChiSquare distribution for the WP34S does not seem (to me) to produce the same result as what is listed in the 21S manual pg. 50. Degrees of freedom = 19 Upper tail probability = 0.001 Keystrokes on WP34S: 19 [STO] J 0.001 [h] [PROB] [ϰ²INV] This results in 5.4068 (in FIX4) The 21S example on pg. 50 of its user manual gives a result of 43.8202 (function name is ϰ²p). This is also consistent with HP48sx MATHLIB function IUTPC(19, 0.001). For reference, the IOP for the v3.2 manual of the WP34S indicates that ϰ²INV should be equal to ϰ²p of the 21S. Is my understanding of how to use this distribution on the WP34S incorrect? Thank you for any insights you may have! [1] HP 48SX Engineering Mathematics Library, John F. Holland  Sanjeev Visvanatha 

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