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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 > esame 12/01
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delleroby
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 esame 12/01

Allora ragazzi come è andata?
A me è sembrato abbastanza semplice, purtroppo potrei anche sbagliare e aver cannato tutto il compito...voi che ne dite?Che ne dite se iniziamo a mettere in comparazione i nostri risultati?
12-01-2011 13:35
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Chobeat
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io penso di aver fatto tutto giusto tranne il fatto del 2ɸ - 1 che mi son portato dietro in 3-4 esercizi sbagliando di conseguenza l'ultimo passaggio.

L'ultimo esercizio era una farsa, i primi 2 veramente facili, il 3 e il 4 un pelo più impegnativi ma veramente roba da pensare non più di 3 minuti per punto.
12-01-2011 14:09
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kidi
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Qualcuno mi sa dire come si fa l'esercizio 4.2 ??
12-01-2011 14:30
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Chobeat
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ricordami qual'era.
12-01-2011 14:35
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kidi
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dove si doveva controllare che P(|1/∑X -µ|<c*sigma)>0.95 per n>(1.96/c)^2 .
12-01-2011 14:43
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kidi
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Scusami era 1/n*∑X-µ non 1/∑X-µ ...
12-01-2011 14:51
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CowBoy
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up...

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Last edited by CowBoy on 12-01-2011 at 15:36
12-01-2011 15:11
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kidi
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si ho fatto cosi ma mi usciva 2ø(c)-1>1-1/c^2*n>0.95 ....
12-01-2011 15:17
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kidi
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No c..o hai ragione te l'ho cannato questo,era facilissimo ,ho sbagliato a mettere il valore del sqrt(var) invece di mettere sigma^2/n ho messo solo sigma pensado al deviazione standard in generale.Grazie cmq
12-01-2011 15:25
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PulceAtomica
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Anche secondo me non era così difficile... salvo poi ricredermi quando usciranno i risultati e avrò un "no" accanto al mio nome... :P
12-01-2011 15:33
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CowBoy
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adesso basta sostituire, fare calcoli e controllare la tabella del ɸ... 2ɸ(c*sigma/sqr(n)) - 1 = 0.95


Ho corretto la soluzione sopra!

n>=(1.96/c)^2

2ɸ(c*1.96/c) - 1 = 0.95
ɸ(1.96) = 0.975

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12-01-2011 15:36
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kidi
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L'ho appena fatto e mi esce ø(c*sqrt(n))>=0.975

c*sqrt(n)>=1.96

sqrt(n)>=1.96/c)

n>=(1.96/c)^2

che era anche la condizione che si doveva controllare.
12-01-2011 15:43
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PulceAtomica
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Questo il tema d'esame

Attachment: statistica_12-01-2011.pdf
This has been downloaded 99 time(s).
12-01-2011 15:46
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CowBoy
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Io l'esercizio I non l'ho toccato... qual'è la soluzione dei due punti secondo voi?

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12-01-2011 16:02
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Chobeat
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Originally posted by CowBoy
Io l'esercizio I non l'ho toccato... qual'è la soluzione dei due punti secondo voi?
a 0,1 (è una normale standard)
b Fx(X)-Fx(-X)
12-01-2011 16:25
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