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UBA - CienciaS :: Ver Tema - [No Resuelto] 1er cuatrimestre 2009 - Ej. 4 - 2do Parcial
UBA - CienciaS
http://ubacs.com.ar/ubacs/

[No Resuelto] 1er cuatrimestre 2009 - Ej. 4 - 2do Parcial
http://ubacs.com.ar/ubacs/viewtopic.php?f=51&t=1390
Página 1 de 1

Autor:  Cloud [ 08 Ago 2009, 13:59 ]
Asunto:  [No Resuelto] 1er cuatrimestre 2009 - Ej. 4 - 2do Parcial

Se quiere testear si el peso promedio de los hombres adultos de la Ciudad de Buenos Aires es 74 kg. o no. Se sabe que el peso está normalmente distribuido.
a) Se toma una muestra independiente de 12 pesos:


(esto da ).
Decidir si se rechaza a nivel 0.20

b) No conforme con el resultado se decide tomar otra muestra independiente de 60 casos, de la que resulta . Calcular el p-valor aproximado. ¿A qué niveles de significación se rechaza ?

c) Si se considera una sola muestra con los datos de las dos muestras anteriores, el p-valor (aproximado) resultante es 05352. Hallar la desviación estándar muestral de esta nueva muestra.

Esto es lo que pude resolver:
a)


La parte b y c no me salieron. Ayuda por favor! :P

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