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On a mesur sur 25 units de mme type d'un montage transistoris, le temps requis par une main-d'oeuvre spcialise pour en effectuer l'assemblage. On a

On a mesur sur 25 units de mme type d'un montage transistoris, le temps requis par une main-d'oeuvre spcialise pour en effectuer l'assemblage. On a obtenu un temps moyen de 10,2 minutes avec un cart-type de 1,8 minutes. Quelle est la marge d'erreur de cet intervalle de confiance, pour le temps moyen rel d'assemblage, ayant un niveau de confiance de 99% ?

The time required for assembly by a skilled worker was measured on 25 units of the same type of transistorized assembly. The average time was 10.2 minutes with a standard deviation of 1.8 minutes. What is the margin of error of this confidence interval for the actual average assembly time at the 99% confidence level?

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