Examen de recuperación Estadística Inferencial
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Examen de Recuperación - Estadística Inferencial
Nombre y Apellido:
……………………………………………………………………………..
TP: 20
Docente:
MSc. Cecilia Corvalán Bernal
PC:
Fecha: 01/11/2023
Indicaciones a tener en cuenta para el desarrollo del examen.
El desarrollo del Examen podrás realizar en una planilla Excel, en Word o en caso de contar con una Tablet, desarrollar en
forma manual.
Su desarrollo es individual, sin derecho a consultas de las anotaciones y en un tiempo no mayor de 2 horas.
Finalmente deberás guardar con su
Nombre y Apellido,
y subir en Classroom, apartado
Examen Parcial Recuperatorio
.
Ante cualquier fraude, el examen será invalidado y comunicado a la coordinación de carrera.
TEMA I: Determina el espacio muestral, aplica la fórmula correcta y responda las preguntas
(3 Puntos).
En una habitación se encuentra el siguiente grupo de personas: 5 hombres mayores de 21 años, 4
hombres menores de 21 años, 6 mujeres mayores de 21 años y 3 mujeres menores de 21 años. Se elige
una persona al azar. Se define los sucesos: A = {la persona es mayor de 21 años}, B = {la persona es
menor de 21 años}, C = {la persona es hombre} y D = {la persona es mujer}.
Calcula la probabilidad de que una persona elegida al azar:
a)
Sea mujer y sea menor a 21 años.
Seleccionado una persona al azar, resulta ser hombre. Calcula la probabilidad de que:
b)
Sea mayor a 21 años
c)
Sea menor a 21 años.
A
B
TOTAL
C
5
4
9
D
6
3
9
TOTAL
11
7
18
a) P(B) = 7/18
P(D) = 9/18
P(B∩D) = 3/18
P(B
⋃
D) = P(B) + P(D) - P(B∩D) = 7/18 + 9/18 - 3/18 = 13/18
b) P(A) = 11/18
P(C) = 9/18
P(A∩C) = 5/18
P(A
⋃
C) = 11/18 + 9/18 - 5/18 = 15/18
UNIVERSIDAD CATÓLICA “NUESTRA SEÑORA DE
LA ASUNCIÓN FACULTAD DE CIENCIAS CONTABLES,
ADMINISTRATIVAS Y ECONÓMICAS
c) P(Ac) = 7/11
P(Bc) = 11/18
P(Ac∩Bc) = 0
P(Ac
⋃
Bc) = 7/11 + 11/18 - 0 =1
d) P(A/C) = P(A∩C)/P(C) = 5/9
e) P(C/A) =
P(A∩C)/P(A) = 5/11
Diagrama de árbol:
TEMA II: Identifica la distribución, calcula el estadístico de prueba, plantea las hipótesis, contrasta el
estadístico con el valor de la tabla y concluya correctamente
(5 Puntos)
Usando los siguientes datos, probar la hipótesis de que el nivel de educación individual y su ajuste al
matrimonio son independientes.
Educación
Ajuste al matrimonio
P:
Pobre
R:
Regular
M: Muy
bueno
A: Profesional
72
112
245
B: Preparatoria
65
90
120
C: Post profesional
95
103
98
UNIVERSIDAD CATÓLICA “NUESTRA SEÑORA DE
LA ASUNCIÓN FACULTAD DE CIENCIAS CONTABLES,
ADMINISTRATIVAS Y ECONÓMICAS
Educación
P (Pobre)
R (Regular)
M (Muy bueno)
Total
A: Profesional
72
112
245
429
B: Preparatoria
65
90
120
275
C: Post profesional
95
103
98
296
Total
232
305
463
1000
Realizando los cálculos, se obtienen los siguientes resultados:
Educación
P (Pobre)
R (Regular)
M (Muy bueno)
Total
A: Profesional
81.78
107.205
240.015
429
B: Preparatoria
66.55
87.375
121.075
275
C: Post profesional
83.67
110.42
101.91
296
Total
232
305
463
1000
Se aplicará la fórmula del estadístico chi-cuadrado:
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