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Suppoe that the height of the population in two countrie i normally ditributed with tandard deviation =21cm. The average adult male height in the firt country i 170cm. We upect that the men in the econd country might have a different average height due to ome environmental factor. We pick a random ample ize of 9 from the adult male in the econd country and obtain that the average height of thi ample i 165. 8 cm. Given the data: Do you reject or not the affirmation that the real average height in the econd country i different to 170cm?

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