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.dsy:it. : Powered by vBulletin version 2.3.1 .dsy:it. > Didattica > Corsi A - F > Calcolo delle probabilità e statistica matematica > Soluzione esame 9 giugno
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alien
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nel punto 4 Hn=Radice(n)* L'espressione
visto che l'espressione alla fine era var(K)
allora
var(Hn)=var(Radice(n)*var(K)
var(k)=1 per deffinizione
var(Hn)=(Radice(n))^2*var(k)=n*1=n

almeno io l'ho pensata cosi.....

09-06-2010 17:32
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maddy
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Counter65 o Alien... come fa a venirvi 180 ? Mi spiegate il procedimento per favore? =)

09-06-2010 17:32
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alien
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....>=1-var(k)/e^2
var(k)=9/n sostituisci e viene fuori n >= 180
ma non cè niente di certo........

09-06-2010 17:34
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Counter65
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in pratica si, si usa il teorema del limite centrale e ti ritrovi facendo un po di conti P(|Hn|<= rad(n)/3) da li = Φ(rad(n)/3) - Φ(-rad(n)/3)=
2Φ(rad(n)/3) -1 >=0.95 => Φ(rad(n)/3) >= 1.95/2= 0.975 che vai a vedere sulle tavole a cosa corrisponde... 1.96 quindi rad(n)/3=1.96 e ricavi n


bho mi sono sbagliato a me viene 35 :/

Last edited by Counter65 on 09-06-2010 at 17:52

09-06-2010 17:40
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alien
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io ho usato chebysceff con var(k)=9/n e il risultato era n>=180

09-06-2010 17:44
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Torre
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ma 180 usciva anche nell' 1.4 o mi sbaglio?

09-06-2010 17:44
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alien
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si era la stessa cosa anche secondo me.....anche perche sono andato a chieder al prof se c'era qualche errore ma mi ha confermato che si parlava della v.c K del primo esercizio.....boh

09-06-2010 17:46
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Counter65
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aspe mi sa che mi sono confuso infatti :)

eh mi sà che l'ho segato...

Last edited by Counter65 on 09-06-2010 at 17:50

09-06-2010 17:47
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Torre
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Io non sono molto convinto del grafico della funzione di ripartizione...
non andava fatta la campana vero? bisognava fare il grafico in cui se z tende a infinito la F(Z) tende a 1

09-06-2010 17:47
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alien
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maaa il 4 come l'avete fato?

09-06-2010 17:48
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alien
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io ho fatto la campana......simetrica all'asse delle ordinate....boh

09-06-2010 17:50
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Torre
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ma quella non è la funzione massa di probabilità? cavolo spero di non aver fatto un errore così stupido perchè mi boccia sicuro con un errore simile

09-06-2010 17:51
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alien
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magari l'ho fato io l'errore.....io dei grafici non sapevo niente....ho visto degli appunti e ho tirato ad indovinare.....

09-06-2010 17:52
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alien
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stavo vedendo delle cose adesso e mi sà che ho sbagliato io il grafico

09-06-2010 17:56
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Counter65
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Originally posted by alien
io ho fatto la campana......simetrica all'asse delle ordinate....boh


il quattro gli ho fatto vedere che quello che c'è scritto è l'applicazione del limite centrale e quindi diventa una normale standard e la normale standard ha valore atteso 0 e varianza 1

il grafico è tipo questo solo che attraversa l'asse y nel punto 1/2






comunque serve qualcuno che è sicuro e posti la soluzione di tutto possibilmente :sad:

09-06-2010 18:00
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