Dsy Network>  www | forum | my | didattica | howto | wiki | el goog | stats | blog | dona | rappresentanti
Homepage
 Register   Calendar   Members  Faq   Search  Logout 
.dsy:it. : Powered by vBulletin version 2.3.1 .dsy:it. > Didattica > Corsi A - F > Calcolo delle probabilità e statistica matematica > Esame 5 luglio
Pages (12): « 1 2 3 [4] 5 6 7 8 » ... Last »   Last Thread   Next Thread
Author
Thread    Expand all | Contract all    Post New Thread    Post A Reply
Collapse
elpampero
Aniversario

User info:
Registered: Sep 2003
Posts: 911 (0.12 al dì)
Location: Milano
Corso: Informatica Magistrale
Anno: I
Time Online: 8 Days, 3:06:36 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

quindi il domandone finale è:
anche se le mie monete sono truccate (per esempio ho che la probabilità di avere testa con un lancio sia 2/3) la mia probabilità condizionata in quel modo è sempre 1/2??
03-07-2007 11:06
Click Here to See the Profile for elpampero Click here to Send elpampero a Private Message Find more posts by elpampero Add elpampero to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
Striker
.precettore.

User info:
Registered: May 2002
Posts: 84 (0.01 al dì)
Location: Arese, Milano
Corso: Informatica...o almeno cosi' dicono...
Anno: N.P.
Time Online: 19:08:17 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

Originally posted by Striker
Penso che sia cosi'

P(X1=1|X1diversoX2) =
P(X1=1 AND ((X1=1 AND X2=0) OR (X1=0 AND X2=1)) / P((X1=1 AND X2=0) OR (X1=0 AND X2=1))


Andando avanti da qua dovrebbe essere:

P[(X1=1 AND (X1=1 AND X2=0)) OR (X1=1 AND (X1=0 AND X2=1))] / P((X1=1 AND X2=0) OR (X1=0 AND X2=1))

= pq + 0 / 2pq = 1/2 ?

E' giusto? Lo 0 sta ad indicare che e' impossibile che la v. c. X1 assuma due valori differenti.

__________________
Under Construction
03-07-2007 11:25
Click Here to See the Profile for Striker Click here to Send Striker a Private Message Visit Striker's homepage! Find more posts by Striker Add Striker to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
elpampero
Aniversario

User info:
Registered: Sep 2003
Posts: 911 (0.12 al dì)
Location: Milano
Corso: Informatica Magistrale
Anno: I
Time Online: 8 Days, 3:06:36 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

Ho ragionato esattamente come te....
03-07-2007 13:08
Click Here to See the Profile for elpampero Click here to Send elpampero a Private Message Find more posts by elpampero Add elpampero to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
Striker
.precettore.

User info:
Registered: May 2002
Posts: 84 (0.01 al dì)
Location: Arese, Milano
Corso: Informatica...o almeno cosi' dicono...
Anno: N.P.
Time Online: 19:08:17 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

Speriamo di non sbagliare in due :-D

In pratica
(X1=1 AND (X1=1 AND X2=0)) si riduce a (X1=1 AND X2=0) perche' include entrambi. E la probab. di questo e' pq

__________________
Under Construction
03-07-2007 13:11
Click Here to See the Profile for Striker Click here to Send Striker a Private Message Visit Striker's homepage! Find more posts by Striker Add Striker to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
elpampero
Aniversario

User info:
Registered: Sep 2003
Posts: 911 (0.12 al dì)
Location: Milano
Corso: Informatica Magistrale
Anno: I
Time Online: 8 Days, 3:06:36 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

Sì sì..ti ho capito perfettamente...secondo me non fa una piega...quindi confermi che se avessimo che il lancio di una moneta è sbilanciato (cioè testa e croce non siano ugual probabili), sarebbe ancora 1/2 perchè non dipende da alcun parametro?
03-07-2007 13:17
Click Here to See the Profile for elpampero Click here to Send elpampero a Private Message Find more posts by elpampero Add elpampero to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
Striker
.precettore.

User info:
Registered: May 2002
Posts: 84 (0.01 al dì)
Location: Arese, Milano
Corso: Informatica...o almeno cosi' dicono...
Anno: N.P.
Time Online: 19:08:17 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

Boh sembrerebbe cosi'...anche se non sono completamente convinto...

__________________
Under Construction
03-07-2007 13:30
Click Here to See the Profile for Striker Click here to Send Striker a Private Message Visit Striker's homepage! Find more posts by Striker Add Striker to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
elpampero
Aniversario

User info:
Registered: Sep 2003
Posts: 911 (0.12 al dì)
Location: Milano
Corso: Informatica Magistrale
Anno: I
Time Online: 8 Days, 3:06:36 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

Esatto..sembrerebbe così ma mi puzza
03-07-2007 13:38
Click Here to See the Profile for elpampero Click here to Send elpampero a Private Message Find more posts by elpampero Add elpampero to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
elpampero
Aniversario

User info:
Registered: Sep 2003
Posts: 911 (0.12 al dì)
Location: Milano
Corso: Informatica Magistrale
Anno: I
Time Online: 8 Days, 3:06:36 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

ALTRO QUESITO:
ho media=0.5, varianza=0,0041. Voglio che la mia variabile disti in valore assoluto meno di 0.05 da 0,5

E' possibile che applicando Chebishev con questi valori salti fuori un numero negativo?!?!?!
03-07-2007 14:38
Click Here to See the Profile for elpampero Click here to Send elpampero a Private Message Find more posts by elpampero Add elpampero to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
khelidan
.grande:maestro.

User info:
Registered: Jun 2003
Posts: 1196 (0.15 al dì)
Location: Milano
Corso: Informatica
Anno: Finito....
Time Online: 13 Days, 12:08:03: [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

Originally posted by elpampero
ALTRO QUESITO:
ho media=0.5, varianza=0,0041. Voglio che la mia variabile disti in valore assoluto meno di 0.05 da 0,5

E' possibile che applicando Chebishev con questi valori salti fuori un numero negativo?!?!?!


Non ho fatto i conti ma chebichev puo benissimo dare un risultato negativo ma a quel punto non ti dice niente di importante,dato che una probabilita e definata tra 0 e uno

__________________
Khelidan
03-07-2007 15:08
Click Here to See the Profile for khelidan Click here to Send khelidan a Private Message Find more posts by khelidan Add khelidan to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
rora
*

User info:
Registered: May 2003
Posts: 30 (0.00 al dì)
Location:
Corso: informatica
Anno: ...
Time Online: 1 Day, 6:46:27 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

con chebicev a me la P(|X-m|<.05) viene maggiore o uguale a - .64 ; qualcuno mi corregge?
dove hai trovato l'es?

Last edited by rora on 03-07-2007 at 15:28
03-07-2007 15:11
Click Here to See the Profile for rora Click here to Send rora a Private Message Find more posts by rora Add rora to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
elpampero
Aniversario

User info:
Registered: Sep 2003
Posts: 911 (0.12 al dì)
Location: Milano
Corso: Informatica Magistrale
Anno: I
Time Online: 8 Days, 3:06:36 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

L'ho calcolato io..ho fatto:
P(|X-0,5|<0.05)>=1-VAR(X)/(0.05)^2
03-07-2007 15:18
Click Here to See the Profile for elpampero Click here to Send elpampero a Private Message Find more posts by elpampero Add elpampero to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
khelidan
.grande:maestro.

User info:
Registered: Jun 2003
Posts: 1196 (0.15 al dì)
Location: Milano
Corso: Informatica
Anno: Finito....
Time Online: 13 Days, 12:08:03: [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

viene -0.64 è plausibile ma non ci dice niente su questa stima!

__________________
Khelidan
03-07-2007 15:24
Click Here to See the Profile for khelidan Click here to Send khelidan a Private Message Find more posts by khelidan Add khelidan to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
rora
*

User info:
Registered: May 2003
Posts: 30 (0.00 al dì)
Location:
Corso: informatica
Anno: ...
Time Online: 1 Day, 6:46:27 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

sì anche usando l'altra formula viene minore di 1.66... come dire che non se ne sa niente, per gli stessi motivi di prima
03-07-2007 15:27
Click Here to See the Profile for rora Click here to Send rora a Private Message Find more posts by rora Add rora to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
elpampero
Aniversario

User info:
Registered: Sep 2003
Posts: 911 (0.12 al dì)
Location: Milano
Corso: Informatica Magistrale
Anno: I
Time Online: 8 Days, 3:06:36 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

A meno che la x non sia una media standardizzata e da lì otterremmo:
P(|X*|<(0.05-0.5)/rad Var(X)) e da qui risolviamo con il teorema centrale della statistica (per cui P(|X*|<k)=F(k)-F(-k))
03-07-2007 15:30
Click Here to See the Profile for elpampero Click here to Send elpampero a Private Message Find more posts by elpampero Add elpampero to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
Collapse
rora
*

User info:
Registered: May 2003
Posts: 30 (0.00 al dì)
Location:
Corso: informatica
Anno: ...
Time Online: 1 Day, 6:46:27 [...]
Status: Offline

Post actions:

Edit | Report | IP: Logged

scusa se insisto, ma questi esercizi da dove arrivano?
03-07-2007 15:32
Click Here to See the Profile for rora Click here to Send rora a Private Message Find more posts by rora Add rora to your buddy list Printer Friendly version Email this Article to a friend Reply w/Quote
All times are GMT. The time now is 12:25.    Post New Thread    Post A Reply
Pages (12): « 1 2 3 [4] 5 6 7 8 » ... Last »   Last Thread   Next Thread
Show Printable Version | Email this Page | Subscribe to this Thread | Add to Bookmarks

Forum Jump:
Rate This Thread:

Forum Rules:
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts 		HTML code is OFF
vB code is ON
Smilies are ON
[IMG] code is ON
 

Powered by: vBulletin v2.3.1 - Copyright ©2000 - 2002, Jelsoft Enterprises Limited
Mantained by dsy crew (email) | Collabora con noi | Segnalaci un bug | Archive | Regolamento | Licenze | Thanks | Syndacate
Pagina generata in 0.046 seconds (85.10% PHP - 14.90% MySQL) con 26 query.