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En una poblaci N(u,o), on es desconeix el valor del parmetre o, s'obt una mostra aleatoria simple de grandria 10, en la que la suma
En una poblaci N(u,o), on es desconeix el valor del parmetre o, s'obt una mostra aleatoria simple de grandria 10, en la que la suma de les variables es 41 i la sima de les variables al quadrat es 229. Determina l interval de confiana del 90% d una Poblaci normal Quina s la nova amplada de l interval si s incrementa a 3,68 i el nivell de significaci es redueix fins a alfa = 0,01
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