In a cereal box filling factory a randomly selected sample of 16 boxes have an average...

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In a cereal box filling factory a randomly selected sample of 16boxes have an average weight of 470 g with a standard deviation of15g. The weights are normally distributed. Compute the 90%confidence interval for the weight of a randomly selected box. [Ithink I can compute the confidence interval but I'm being thrownoff by the "randomly-selected box" requirement].

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