Probabilités conditionnelles, Bayes et Indépendance : cours 3 Flashcards

1
Q

Théorème de la multiplication : P(AnB) =

A

P(AnB) = P(B) x P(A/B) = P(A) x P(B/A)

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2
Q

Formule de Bayes = P(A/B) =

A

P(A/B) = P(AnB)/P(B) = (P(B/A) x P(A))/P(B)

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3
Q

Théorème de Bayes = P(A1/B) =

A

P(B/A1) x P(A1)
P(A1/B) = —————————————————————–
P(B/A1)xP(A1) + P(B/A2)xP(A2) + P(B/A3)xP(A3)

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4
Q

Deux événements sont indépendants si :

A

P(AnB) = P(A) x P(B)

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5
Q

Si deux éléments sont inclus ils sont …

A

PAS indépendants !!

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6
Q

Si deux éléments sont disjoints ils sont …

A

PAS indépendants !!

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7
Q

Deux événement sont incompatibles si :

A

P(AuB) = P(A) + P(B)

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