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3. En el problema de de una Empresa (vase figura 7.4 y la figura 7.5), se mostr que con n =30, la probabilidad de que
3. En el problema de de una Empresa (vase figura 7.4 y la figura 7.5), se mostr que con n =30, la probabilidad
de que la media muestral no difiriera ms de $500 de la media poblacional era 0.5034.
a. Cul es la probabilidad de que la media muestral no difiera ms de $500 de la media poblacional si
se usa una muestra de tamao 60?
b. Responda el inciso a si el tamao de la muestra es 120.
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