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The ages at which death occurs, for a random sample of 39 individuals who died from tuberculosis, give a mean of 50 years and a

The ages at which death occurs, for a random sample of 39 individuals who died from tuberculosis, give a mean of 50 years and a sample standard deviation of 6 years. Assuming normal distribution, we ask:

a) Estimates by unbiased points of the mean and variance.

b) Find a confidence interval for the mean at the 99% level.

Spanish:

Las edades en que se produce la muerte, para una muestra aleatoria de 39 individuos fallecidos de tuberculosis, dan una media de 50 aos y una desviacin tpica muestral de 6 aos. Suponiendo normal la distribucin, se pide:

a) Estimaciones por puntos no sesgados de la media y la varianza.

b) Hallar un intervalo de confianza para la media al nivel del 99%.

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