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Question: assume that the weights of st bernards are normally distributed...

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7. Assume that the weights of St. Bernards are normally distributed. We select 5 St. Bernards at random, and get weights of 40 kg, 50 kg, 60 kg, 80 kg and 90 kg. Test the hypothesis that the average weight of a St. Bernard is at least 70 kg, against the alternative hypothesis that it is less than 70 kg, at a .05 level of significance.
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