[WP-34S] Chi-Square Distribution
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01-11-2014, 01:37 PM
Post: #1
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[WP-34S] Chi-Square Distribution
Hello,
I was comparing output between HP48sx MATHLIB [Ref. 1] and WP-34S (v 3.2 3375) for some of the probability distributions. For this purpose, I was replicating the examples from the HP-21S user's manual (pg. 42-52) I noticed that the Inverse of the Chi-Square distribution for the WP-34S 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 WP-34S: 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 HP-48sx MATHLIB function IUTPC(19, 0.001). For reference, the IOP for the v3.2 manual of the WP-34S indicates that ϰ²INV should be equal to ϰ²p of the 21S. Is my understanding of how to use this distribution on the WP-34S incorrect? Thank you for any insights you may have! [1] HP 48SX Engineering Mathematics Library, John F. Holland -- Sanjeev Visvanatha |
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