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Randomly selected from the production process

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A sample of 75 packets of cereals was randomly selected from the production process and found to have a mean of 500g and standard deviation of 20g. A week later a second sample of 50 packets of cereal was selected, using the same procedure, and found to have a mean of 505g and standard deviation of 16g. Construct a 95 per cent confidence interval for the change in the average weight of cereal packets.

Reference no: EM131064306

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