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Universidad de Castilla-La Mancha
Centro de Estudios Jurídicos-Empresariales (Ciudad Real)
Administración y Dirección de Empresas
EXAMEN DE ESTADÍSTICA DESCRIPTIVA (29-01-96)
1. El consumo y la renta mensual de 100 familias, expresadas en 104 ptas., son los siguientes:
R C | 15 | 25 | 35 | 45 |
30 | 10 | 15 | 0 | 0 |
40 | 5 | 20 | 25 | 0 |
50 | 0 | 15 | 5 | 5 |
Estudiar si ambas variables son independientes.
Calcular la recta de regresión del consumo sobre la renta.
Consumo esperado para una renta de 60·104 ptas.
2. Se ha estudiado las calificaciones de 100 alumnos en dos asignaturas (X = Matemáticas, Y = Estadística), obteniéndose los siguientes datos:
S2y = 0'5 r = -0'85 øx = 110
" yj nj = 250 " xi2 ni = 1.211.000
j i
Calcular la recta de regresión X/Y.
3. Demostrar analíticamente cómo varía la covarianza de X e Y ante un cambio de escala sobre X e Y de magnitud K, siendo K > 0.
4. Dadas las siguientes series de índices de precios
AÑOS | IPC BASE 81=100 | IPC BASE 83=100 | IPC BASE 86=100 |
1981 | 100 | | |
1982 | 107 | | |
1983 | 118 | 100 | |
1984 | | 114 | |
1985 | | 117 | |
1986 | | 120 | 100 |
1987 | | | 105 |
calcular la serie completa IPC BASE 83 =100
5. Dada la siguiente distribución de la variable renta
Li - 1 - Li | ni |
60 - 70 | 2 |
50 - 60 | 5 |
40 - 50 | 10 |
30 - 40 | 15 |
20 - 30 | 11 |
10 - 20 | 7 |
Calcular el valor de la variable que separa al 50 % de los que más ganan del 50 % de los que menos ganan.
Calcular el cuarto decil y el vigésimo percentil.
Calcular el índice de Gini.
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Enviado por: | Benito Prieto |
Idioma: | castellano |
País: | España |