help on probabilty  binomial

11202017, 09:46 PM
Post: #1




help on probabilty  binomial
Dears,
I have an urgent request, my daughter uses hpprime, student are studying probability at the moment, I'm really not an expert on that point myself, unfortunately. She could find how to compute P(x=k) by using builtinbinomial(n,p,k) But we could not find how to compute P(x<k) ? anyone knows ? I can't belive there is such option in hp prime. cheap casio calc, offers function "Bcd" for that, what's the hp equivalent ? Thank you. primer 

11202017, 10:07 PM
(This post was last modified: 11202017 10:19 PM by salvomic.)
Post: #2




RE: help on probabilty  binomial
(11202017 09:46 PM)primer Wrote: Dears, I think you should use BINOMIAL_CDF(n, p,k,[k2]) that "returns the probability of k or fewer successes out of n trials..." optional k2 returns the probability for the two kvalues, that is the probability of between k and k2... Salvo EDIT: most distribution in the Prime and CAS distinguish between Density and Cumulative values (and also Inverse). i.e.: 100 trials, prob. ½ (50%) k=50 BINOMIAL(100,1/2,50) = 7.958E2 (only upon 50) BINOMIAL_CDF(100,1/2,50) = 0.539794 (cumulative, from 0 to 50) BINOMIAL_CDF(100,1/2,50)BINOMIAL(100,1/2,50) = 0.4602053... that the probability to have 49 successes on 100 trials, or BINOMIAL_CDF(100,1/2,49) If I well understand your needs... ∫aL√0mic (IT9CLU) :: HP Prime 50g 41CX 71b 42s 39s 35s 12C 15C  DM42, DM41X  WP34s Prime Soft. Lib 

11202017, 10:35 PM
Post: #3




RE: help on probabilty  binomial
(11202017 10:07 PM)salvomic Wrote: I think you should use BINOMIAL_CDF(n, p,k,[k2]) that "returns the probability of k or fewer successes out of n trials..."Yes, thank you.... it was helpfull, I was totally lost in Inference app, it was a nightmare ! Not so easy to follows these probability stuffs. primer 

11202017, 10:42 PM
(This post was last modified: 11202017 10:43 PM by salvomic.)
Post: #4




RE: help on probabilty  binomial
(11202017 10:35 PM)primer Wrote:(11202017 10:07 PM)salvomic Wrote: I think you should use BINOMIAL_CDF(n, p,k,[k2]) that "returns the probability of k or fewer successes out of n trials..."Yes, thank you.... it was helpfull, I was totally lost in Inference app, it was a nightmare ! well I think we need not only Inference app, but also a Probability app with some facilities for the implemented distributions and other related things (random, permutations...), a part of the menu Math>Probability... ∫aL√0mic (IT9CLU) :: HP Prime 50g 41CX 71b 42s 39s 35s 12C 15C  DM42, DM41X  WP34s Prime Soft. Lib 

11202017, 11:26 PM
Post: #5




RE: help on probabilty  binomial
Yes, I'm thinking exactly the same.
primer 

« Next Oldest  Next Newest »

User(s) browsing this thread: 1 Guest(s)