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.- Un fabricante de llantas garantiza que su producto dura en promedio 2.5 aos con una desviacin estndar de 0.8 aos. Si se toma una

.- Un fabricante de llantas garantiza que su producto dura en promedio 2.5

aos con una desviacin estndar de 0.8 aos. Si se toma una muestra

aleatoria de 8 llantas y result que la media es X= 2.8 y s = 1.2 y, con la

evidencia tomada tiene razn el fabricante respecto a la desviacin estndar

poblacional? Utilice un nivel de significancia de 0.01.

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