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In french Exercice 5 : La duree de vie d'une ampoule de 75 watts est normalement distribuce de moyenne u heures et de variance o'.

In french

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Exercice 5 : La duree de vie d'une ampoule de 75 watts est normalement distribuce de moyenne u heures et de variance o'. D'un echantillon aleatoire de 20 ampoules, la moyenne de l'echantillon est de 1014 heures et l'ecart type de l'echantillon est de 25 heures. (a) Calculer un intervalle de confiance a 95% pour /. (b) Supposons que o =25 heures. Nous planitions une nouvelle etude. Determiner la taille de I'echantillon requise afin qu'on soit 95% confiant que l'erreur de l'estimation soit infericure a 4.5 heures

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