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Estadística (Funda. Investigación) (Mauro)
Probabilidad
Probabilidad clásica
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Cards (11)
Calcula toda probabilidad usando la fórmula de
LaPlace
:
Casos favorables
/
Casos totales
Resultado --> Entre
0
y
1
Ejercicios
sin
devolución
--> Casos favorables
restan
/ Casos totales
restan
Ejercicos
con
devolución
--> Casos favorables/Casos totales
^ =
Y
u =
O
Para sacar las distintas combinaciones (Ejercicios de intersección) =
Factorial
de casos
totales
/
factorial
de los que
estoy
buscando
Fórmula para unión (u)
P
(
A
u
B
)
=
P(A u B) =
P
(
A
u
B
)
=
P
(
A
)
+
P(A) +
P
(
A
)
+
P
(
B
)
−
P
(
A
u
B
)
P(B) - P(A u B)
P
(
B
)
−
P
(
A
u
B
)
Ejercicios de unión =
No
hay
devolución
Si resultados son diferentes =
No
son
independientes
Si resultados son iguales =
Eventos
independientes
(Comprobar con otras
casillas
)
Probabilidad de eventos condicionados
Evento es condicionado = Evento
A
SI
afecta evento B
(Probabilidad de
A
sabiendo que ha ocurrido
B)
Fórmula:
P
(
A
/
B
)
=
P(A/B)=
P
(
A
/
B
)
=
P
(
A
y
B
)
/
P
(
B
)
P(A y B)/P(B)
P
(
A
y
B
)
/
P
(
B
)
Probabilidad de
eventos
independientes
Evento es
independiente
= Evento
A NO afecta
evento B
Fórmula:
P
(
A
y
B
)
=
P(A y B)=
P
(
A
y
B
)
=
P
(
A
)
∗
P(A)*
P
(
A
)
∗
P
(
B
)
P(B)
P
(
B
)
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